Most London SMEs don’t think they’re a target.
They’re not running a bank. They’re not storing state secrets. They’re just trying to deliver work, keep customers happy, and get through the week without another “can you quickly look at this?” message.
Or, more simply: “we’re too small to be of interest”. But attackers rarely choose targets manually. They scan for weak passwords, exposed accounts, missing MFA, and unpatched systems at scale — and small businesses are often swept up because the gaps are easier to exploit.
That’s exactly why cyber security gaps are so common.
Security usually grows in layers: a bit of antivirus here, a firewall rule there, a few people using MFA, a shared admin login that “everyone needs”. Nothing feels urgent until it is.
This guide covers the cyber security gaps we see most often in London SMEs, why they matter, and the fastest practical fixes that reduce risk without turning your business into a compliance project.
TL;DR: Most breaches don’t happen because hackers are geniuses. They happen because basic controls are missing or inconsistent: weak MFA, poor password habits, unmanaged devices, risky email settings, and backups that haven’t been tested. Fixing the fundamentals quickly lowers your risk more than buying another shiny tool.
Key takeaways
- Email and identity are the main battleground for SMEs, so start with Microsoft 365 security basics
- MFA is essential, but it needs to be enforced properly and paired with sensible access controls
- Unpatched devices and unmanaged laptops create silent, compounding risk
- Backups only count if you can restore, so test them and document the process
- You don’t need perfection, you need consistency, visibility, and a clear owner
Why cyber security gaps happen in growing SMEs
Most small businesses don’t ignore security on purpose. They just inherit it.
A typical London SME setup evolves like this:
- a few laptops and a router become a “network”
- Microsoft 365 gets added for email and files
- remote work becomes normal
- a new app is added every month to keep things moving
- someone leaves, and their access isn’t fully removed
- a supplier asks for access, and it’s granted quickly
Over time, you end up with a system that works, but isn’t governed.
The good news is that most of the biggest risks can be reduced quickly with a focused set of actions.
The most common cyber security gaps we see
Gap 1: MFA is optional, inconsistent, or bypassed
A lot of SMEs have MFA “enabled”, but not enforced.
Common patterns:
- Senior staff don’t use MFA as it’s a pain
- MFA is enabled for email, but not for admin accounts
- users can skip MFA prompts for long periods
- shared accounts exist with weak MFA controls
What this means
If an attacker gets a password (usually via phishing), MFA is the barrier that stops the account takeover. If MFA isn’t enforced properly, a single stolen password can become a full mailbox compromise.
Fast fix
- Enforce MFA for all users, with no exceptions for admin accounts
- Remove shared logins where possible, or lock them down tightly
- Review sign-in logs for risky locations and unusual behaviour
Gap 2: Too many people have admin access
Admin access is like having the keys to the building.
Common patterns:
- multiple users are global admins “just in case”
- admin accounts are used for day-to-day work
- old admin accounts remain after staff leave
- rename admin accounts to something other than admin or administrator
What this means
If an admin account is compromised, the attacker can change security settings, create new accounts, and lock you out.
Fast fix
- Reduce admin accounts to the minimum needed
- Use separate admin accounts for admin tasks only
- Remove old accounts and confirm offboarding is complete
Gap 3: Patching is ad-hoc and devices drift out of compliance
Unpatched devices are one of the easiest ways for attackers to gain a foothold.
Common patterns:
- laptops are updated when someone remembers
- devices are left on old versions because “it still works”
- third-party apps are never updated
- remote devices miss updates for weeks
What this means
Security vulnerabilities don’t wait for your next quiet week. If patching isn’t consistent, you’re relying on luck.
Fast fix
- Set a patching schedule and stick to it
- Monitor patch compliance and chase exceptions
- Include key third-party apps in patching, not just Windows/macOS
Gap 4: Email security is basic and phishing is treated as unavoidable
Phishing is still the most common entry point for SMEs.
Common patterns:
- staff are unsure what to report
- suspicious emails are deleted, not reported
- email filtering is minimal
- mailbox rules are not monitored
What this means
A single successful phishing email can lead to:
- invoice fraud
- account takeover
- data leakage
- ransomware entry points
Fast fix
- Make reporting easy and encourage it
- Review mailbox rules for suspicious forwarding
- Tighten email security settings and monitor risky sign-ins
Gap 5: Backups exist, but restores haven’t been tested
This one is painfully common.
Common patterns:
- backups run, but no one checks them
- backups are monitored, but restores are never tested
- Microsoft 365 data is assumed to be backed up
- the restore process lives in one person’s head
What this means
Backups are only useful if you can restore quickly and confidently.
Fast fix
- Run a restore test and document the steps
- Confirm what is backed up and what is not
- Monitor backup success and alert on failures
Gap 6: Offboarding is inconsistent
People leave. Access often lingers.
Common patterns:
- accounts are disabled but not removed from groups
- shared mailbox access remains
- third-party app access is forgotten
- devices are not recovered or wiped
What this means
Old access is an open door. Sometimes it’s exploited, sometimes it’s just a compliance headache waiting to happen.
Fast fix
- Use a simple offboarding checklist
- Remove access across Microsoft 365 and key apps
- Confirm device recovery and wipe where needed
Gap 7: No clear owner for security
This is the gap that creates all the others.
Common patterns:
- IT support is reactive, so nobody is driving improvements
- security decisions are made in a rush
- there’s no regular review of risks and priorities
What this means
If nobody owns security outcomes, it becomes a series of one-off fixes.
Fast fix
- Assign ownership (internal or via your MSP)
- Set a simple monthly review: what improved, what’s still risky, what’s next
What to fix first: a simple priority table
| Priority | Gap to fix | Why it matters | Quick win action |
| 1 | MFA enforcement | Stops most account takeovers | Enforce MFA for all users and admins |
| 2 | Admin access control | Limits blast radius | Reduce admins, separate admin accounts |
| 3 | Patching consistency | Reduces known vulnerabilities | Patch schedule + compliance monitoring |
| 4 | Backup restore testing | Makes recovery real | Run a restore test and document it |
| 5 | Offboarding process | Removes lingering access | Checklist for accounts, apps, devices |
This isn’t about being perfect. It’s about closing the gaps that attackers actually use.
What “good” looks like for a London SME
You don’t need enterprise-level security theatre. You need a setup that’s managed, visible, and repeatable.
A practical “good” baseline looks like:
- MFA enforced for everyone
- admin access tightly controlled
- patching scheduled and monitored
- backups monitored and restore-tested
- staff know how to report suspicious emails
- a monthly security review with actions
What a security gap review actually involves
If you’re considering a security gap review, it should be practical, not a 40-page report that nobody reads.
A useful review typically covers:
- Microsoft 365 identity and access settings
- device patching and endpoint protection status
- backup coverage and restore readiness
- email security posture and risky sign-ins
- offboarding and access hygiene
The output should be a prioritised action plan with quick wins and clear ownership.
What cyber security gaps mean when you’re choosing an MSP
If you’re comparing providers, ask how they handle the fundamentals.
What security controls are included by default?
Ask for specifics on:
- MFA enforcement
- monitoring and alerting
- patching schedules
- backup monitoring and restore testing
- reporting and recommendations
How do you prove it’s working?
Look for:
- regular reporting with actions
- evidence of patch compliance
- evidence of backup success and restore tests
- clarity on who owns security outcomes
Conclusion: close the gaps that cause real incidents
Most London SMEs don’t need a bigger security budget. They need the basics done consistently.
If you want to reduce risk quickly, start with identity, patching, backups, and access hygiene. These are the areas that stop the most common attacks and make recovery possible when something goes wrong.
If you’d like a practical security gap review, book a call. We’ll help you identify the biggest risks in your current setup, prioritise quick wins, and build a sensible plan to tighten security without slowing the business down.