IT Services and Support Agencies in Greater London

6 IT Services and Support agencies are listed in Greater London, United Kingdom. 6 have been assessed on the Agency List Score as of October 2026; the highest-ranked is Theodo at 96.4.

Paid placement· Partner agencies. Not part of the ranking.

Paid placement
FocusReactive
Verified#2 of 6 assessed

Next.js development company. Headless CMS builds for replatforming, migration, and multi-market publishing

Headless CMS Development

Ranked · 4 of 6 assessed

Ordered by Agency List Score
#1 of 6 assessed
Theodo
96

Agile software consultancy specializing in web, mobile, and cloud solutions

Cross Platform AppsMobile CI CD
#2 of 6 assessed
FocusReactive
95
Verified

Next.js development company. Headless CMS builds for replatforming, migration, and multi-market publishing

Headless CMS Development
#3 of 6 assessed
Doherty
74

Managed IT support and cybersecurity with Microsoft expertise

Backup and Disaster RecoveryManaged IT ServicesMicrosoft 365 Administration
#4 of 6 assessed
Forterro
73

ERP and industrial software solutions for 25,000+ businesses

Managed IT Services

Also in Greater London · 2 not ranked here

0 have not yet been assessed on the Agency List Score. Alphabetical.

About this ranking

What this page ranks

This page ranks 4 of the 6 assessed IT Services and Support agencies in Greater London, United Kingdom — the ones carrying a published score — out of 6 listed.

The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.

Cohorts and awards

Agencies are compared within a cohort — here, IT Services and Support in Greater London, United Kingdom. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 6, so no award can be issued here.

A further 2 were assessed and no published evidence of their work was found, so no score is shown for them.

Read the full methodology

Paid placement

The Partner agencies in the labelled block at the top of this page pay for that placement and carry a direct link to their own website.

Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.

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Questions

How many IT Services and Support agencies are in Greater London, United Kingdom?
6 are listed on Agency List in Greater London, United Kingdom. 6 of them have been assessed on the Agency List Score as of October 2026, and 4 of those carry a published score.
Which IT Services and Support agency in Greater London, United Kingdom is ranked highest?
Theodo, with an Agency List Score of 96.4, ranks #1 of 6 assessed agencies in IT Services and Support in Greater London, United Kingdom.
Why are 2 IT Services and Support agencies listed here but not ranked?
0 of the 6 listed have not yet been assessed on the Agency List Score. A further 2 were assessed and no published evidence of their work was found, so no score is shown for them. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
How is the ranking determined?
By Agency List Score, within the IT Services and Support in Greater London, United Kingdom cohort of 6 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.