Microsoft 365 security & cyber assurance for UK small businesses

Your clients trust you with everything. Your Microsoft 365 should be as careful as you are.

A fixed-price, expert security uplift of your Microsoft 365, built for small businesses, especially law firms, mortgage brokers and IFAs, who cannot afford a breach, a regulator's question, or a client who quietly loses faith.

Book a 30-minute consultation Read the options
◦ Cyber Essentials aligned ◦ UK engineers ◦ No tie-ins
Exhibit 00: Specimen● Representative
From   A partner's mailbox, attacker-controlled
Re     Your matter, updated remittance details

"Further to the below, please note our account details have changed. Kindly send the balance to account 40 21 66 / sort code 09 01 28 before Friday. Apologies for the short notice."

Representative, the kind of message a resident intruder sends from a mailbox they control. Hover or tap to reveal.
INTERCEPTED
Finding 01: The order matters

We fix your Microsoft 365 before we monitor it.

Most providers sell you a dashboard and call it security. We start by closing the gaps that actually let people in, misconfigured mailboxes, dormant admin rights, licences bought but never switched on. Only once the foundations are sound does monitoring mean anything at all.

Exhibit A

For a regulated firm, a breach is never just an IT problem.

§ 01

Client money

Redirected completion funds and invoice fraud land on the firm, not the bank. The sums are rarely small.

§ 02

Your regulator

The SRA, FCA and ICO all expect you to protect client data. "We assumed Microsoft handled it" is not an answer.

§ 03

Confidentiality

One compromised mailbox exposes years of privileged correspondence and sensitive personal data.

§ 04

Reputation

Referrals dry up quietly. Clients rarely say they left because of a breach, they just stop calling.

Exhibit B: Case file · Confidential

A real client.
A real breach.
A full rebuild.

A UK company trusted with sensitive client data came to us after a phishing attack reached their clients. In just under two months we rebuilt their Microsoft 365 security from the ground up. What we put in place:

01

Built a full Conditional Access suite, phishing-resistant MFA for admins, risk-based sign-in blocks and tighter session limits, so a stolen password on its own can no longer open the door to client files.

02

Brought the powerful admin accounts under PIM with approval workflows and monitored break-glass accounts, so the keys attackers hunt for are locked away, handed out only when needed, and always logged.

03

Enrolled and hardened every device in Intune with Defender for Endpoint, and forced email authentication (SPF, DKIM, DMARC), so only trusted laptops and phones connect, and nobody can send email pretending to be the firm.

04

Layered on Defender threat detection watching for anomalies and OAuth abuse, ~96 controls in all, to a Cyber Essentials Plus-aligned baseline, so attacks are caught early and the firm can show, on paper, that it takes security seriously.

Pricing

Start where it makes sense for your firm.

L1Self-Service

Set up, then yours to run

A one-off assessment and configuration of your Microsoft 365, handed over for you to run. We set the recommended controls to report-only and show you what to switch on. Nothing is enforced and there's no ongoing support, so you'll need someone technical to hand it over to.

£1,800 One-off uplift
Self-service administration
✓Full assessment of your Microsoft 365
✓Recommended controls set to report-only
✓Email authentication set up (SPF, DKIM, DMARC)
✓Written assessment, yours to keep
✕No rules enforced · no ongoing support
Prerequisites
✓Expertise in-house for ongoing administration
Start self-service →
L2Managed

Enforced, and kept right

Everything in Self-Service, plus we turn the protections on and keep them right as Microsoft and your firm change. This is where the rules are actually enforced, with ongoing support and reporting as part of the service, the continuity a one-off can't give you.

£1,800 One-off uplift
+ £200 / month · 12-month commit
✓Everything in Self-Service
✓Security rules enforced (MFA, Conditional Access)
✓MDM & security keys set up
✓Ongoing hardening & support
✓Two support cases per month
✓Plain-English reporting
✓Where most firms start
Talk about Managed →
L3Managed Plus

Watched, so you needn't

Everything in Managed, plus round-the-clock monitoring, incident response and certification alignment. Someone is watching your Microsoft 365, and if something happens, we handle it, not you.

£1,800 One-off uplift
+ £750 / month · 12-month commit
✓Everything in Managed
✓Round-the-clock monitoring (our MDR service)
✓Unlimited incident response
✓Certification (Cyber Essentials / CE+) alignment
✓Audit-ready reporting; optional board-ready report
✓Monitored 24/7, 365 days a year
Talk about Managed Plus →
Control schedule

What's included, control by control

Ref
Control
L1 Self-Service
L2 Managed
L3 Managed Plus
SEC-01
MFA enforced across all accounts
○
●
●
SEC-02
Privileged / admin account hardening
●
●
●
SEC-03
Email authentication (SPF, DKIM, DMARC)
●
●
●
SEC-04
Anti-phishing & impersonation protection
●
●
●
SEC-05
Safe Links & Safe Attachments
●
●
●
SEC-06
Conditional access, report-only assessment
●
●
●
SEC-07
Written assessment
●
●
●
SEC-08
Conditional access, enforcement & policy upkeep
○
●
●
SEC-09
Ongoing support & hardening
○
●
●
SEC-10
MDM enrollment, setup & configuration
○
●
●
SEC-11
Security key (FIDO2) configuration & setup
○
●
●
SEC-12
Plain-English reporting
○
●
●
SEC-13
Monitoring & alerting on your Microsoft 365
○
○
●
SEC-14
MDR platform licence
○
○
●
SEC-15
Incident response
○
2 / mo
Unlimited
SEC-16
Certification (Cyber Essentials / CE+) alignment
○
○
●
SEC-17
Audit-ready reporting
○
○
●
SEC-18
Board-ready report (optional)
○
○
●
SEC-19
Staff phishing awareness training
○
○
●

● Included    ○ Not in this tier  ·  Prices based on a 10-user organisation. The one-off uplift is fixed scope; L2/L3 add a monthly retainer on a 12-month term. Final figures confirmed after the consultation, no obligation.

The maths  ·  One hire, or a whole team
Hire it in-house
£515/ day

A security administrator on contract (UK median). One person, no cover, office hours only.

&DEV Managed
£200/ month

Your protections enforced and kept right by our team, with support and reporting, for less than half a day of a contractor's time a month.

Rate: itjobswatch.co.uk, UK median Security Administrator for the 6 months to July 2026, £515/day (£35,000/yr). &DEV Managed from £200/month on a 12-month term.

Note to file

What we don't do

i.

Rip out what works

If your setup is sound, we'll say so and leave it alone. We're not here to sell you things you don't need.

ii.

Tie you into hardware

This is about your Microsoft 365. No servers to buy, no five-year contracts, no vendor lock-in.

iii.

Hide behind jargon

You'll always get plain English and a written record a non-technical partner can read and act on.

Field guides

Plain-English how-tos for your staff

How-to · Microsoft account Add your security key. Register a hardware security key (such as a YubiKey) as a passkey on a Microsoft 365 account, in eight steps with screenshots. Also available as a printable PDF. Read the guide →
Why guides

The one change your people will notice is stronger sign-in. A one-page guide they can follow at their desk, or print and keep, means nobody is caught out on the day.

On the record

Microsoft 365 security questions, answered

Not fully. It has excellent security tools, but almost none of the important ones are switched on by default, and Microsoft only secures the platform, not how your accounts, devices and data are set up. We turn on and configure the protections you're very likely already paying for in your licences.

Start with the controls that stop most attacks: multi-factor authentication on every account, locked-down admin accounts, legacy sign-in blocked, email authentication (SPF, DKIM, DMARC), Defender anti-phishing and Safe Links, and only managed devices allowed in. Then check your Microsoft Secure Score and keep it under review. You can work through our free checklist yourself, or we'll do it for you as a fixed-price uplift. Read the Microsoft 365 security checklist →

Cyber assurance means being able to show, with evidence, that your security controls are in place and working. For most small businesses that starts with Cyber Essentials, moves to Cyber Essentials Plus when a customer or contract asks for independent testing, and can extend to IASME Cyber Assurance for wider governance. Customers, insurers and regulators increasingly ask for it. The uplift puts the Microsoft 365 controls in place and gives you a written record of them. Cyber assurance options compared →

It covers the Microsoft 365 side of it: secure configuration, user access control and malware protection for your accounts, email and managed devices. Cyber Essentials also looks at firewalls, routers and software updates on every device, so we'll tell you what else is in scope. Managed Plus includes Cyber Essentials and Cyber Essentials Plus alignment; the certificate itself is issued by an IASME certification body.

General IT support keeps you working day to day; it rarely means someone has deliberately secured your Microsoft 365 against a targeted attack. The two jobs are different, and we're happy to work alongside your existing provider.

The consultation is 30 minutes. The Self-Service setup is typically completed within a week or two, scheduled around your business so there's no disruption to your team.

Almost never. Most changes happen behind the scenes. The main visible change is stronger sign-in, which we roll out with clear guidance so nobody is caught out. See the security key guide →

Yes. The uplift directly supports the data-protection and confidentiality obligations those regulators expect, and the written summary gives you evidence of the steps you've taken.

The one-off uplift is £1,800 for a typical 10-user organisation, with a fixed scope. Managed adds £200 a month and Managed Plus £750 a month, both on a 12-month term. Larger organisations get exact figures after the consultation, with no obligation.

Book a consultation

Book a 30-minute consultation.

A straightforward call to talk through where firms like yours are most exposed, answer your questions, and explain how the uplift works. No system access, no obligation, just an honest conversation.

✓  No prep needed from your side ✓  You speak to an engineer, not a salesperson ✓  Honest advice, no obligation
Available times · UK

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Summary

The uplift at a glance

Who it's for
UK small businesses that run on Microsoft 365, especially law firms, mortgage brokers and IFAs who handle client money or confidential data.
What we do
Assess and configure your Microsoft 365 security: MFA and Conditional Access, admin account lockdown, email authentication (SPF, DKIM, DMARC), anti-phishing, device management with Intune, and Microsoft Defender.
Price
£1,800 one-off for a typical 10-user organisation. Optional Managed service at £200 a month, or Managed Plus with 24/7 monitoring at £750 a month, both on a 12-month term.
How long
A 30-minute consultation, then the Self-Service setup is typically complete within one to two weeks, scheduled around your team.
Standards
Aligned to Cyber Essentials. Managed Plus includes Cyber Essentials and Cyber Essentials Plus alignment, and you get a written record of every control.
Who delivers it
&DEV Limited (and.dev), a UK company (Companies House 11895018) founded in 2019, with UK-based engineers.