An early-stage London cybersecurity firm — either a product company (SaaS detection / response / posture / identity) or a services firm (pen-testing, red-team, CISO-as-a-service, SOC). The win is reaching first mid-market / enterprise UK contracts while holding CREST / NCSC CHECK / Cyber Essentials Plus accreditations + ISO 27001 + SOC 2.
A London cybersecurity firm at pre-seed → Series A is one of two models — a services firm (pen-test / red-team / CISO-as-a-service, predictable utilisation cash) or a product company (volatile MRR, venture-scale upside). Hybrids work if services revenue funds product without diluting credentials. The biggest lever is accreditation discipline — without CREST + Cyber Essentials Plus + ISO 27001 you cannot bid for FS / public-sector / FTSE work. The second lever is talent — CHECK / OSCP-qualified engineers in London command £85k–£140k; under-paying creates immediate churn that breaks delivery. This playbook covers operationalising a London cyber firm from incorporation through first £500k–£1.6m revenue (services) or £40k+ MRR (product).
Sized for a 2–4 chair shop. Buy mid-range on chairs and clippers; cheap kit fails inside 12 months and walks away with your barbers.
Banks + insurers + asset managers expect on-site pen-test scoping + incident-response runbooks.
Cabinet Office / NCSC procurement runs face-to-face stakeholder cadence.
UK cyber-active VCs (AlbionVC / Forward / Octopus / OUTI / NATO Innovation Fund) cluster here.
CREST + Cyber Essentials Plus require evidenced physical security controls.
UK figures for 2026. Lead times assume you submit complete applications — councils will pause the clock if you miss documents.
Interactive projections rebuilt from real UK operating data — toggle the views to see ramp, mix and weekly load.
Source · NAVIZIX 2026 London Seed–Series A cybersecurity cohort (n=11 firms, 5–18 staff)
Topco incorporated; secure-lab build started
Cyber Essentials Plus + Vanta live; ICO registered
First pen-tests delivered; £20k+ booked
ISO 27001 stage 1; 65%+ utilisation or £10k MRR
ISO 27001 + CREST application submitted; first FS contract
CREST member; £700k+ revenue or £80k+ MRR; Series A data room ready
ARR per protected endpoint / user / SOC seat (product) or utilisation + day-rate (services), CREST + NCSC CHECK + Cyber Essentials Plus + ISO 27001 + SOC 2 accreditation status, runway months and renewal / repeat-engagement rate.
Pick a wedge (managed-detection / posture / identity / pen-test / CISO-as-a-service), prioritise CREST + Cyber Essentials Plus + ISO 27001 from day one, sell into UK regulated sectors (FS / health / public sector) via NCSC + UK Cyber Security Council channels.
Daily incident + alert digest, weekly account-health + renewal pipeline, monthly accreditation-evidence pack refresh, weekly investor / partner update, NCSC + CISA + UK threat-feed monitor, ICO breach-notification timer.
EDR (CrowdStrike / SentinelOne / Defender), SIEM (Splunk / Sentinel / Elastic), IdP (Okta / Entra ID / WorkOS), ticketing (Jira / ServiceNow), Vanta / Drata, HubSpot CRM, Trustpilot + G2.
ARR per endpoint, MTTR + MTTD (product), utilisation + day-rate + repeat-rate (services) vs UK Seed–Series A cyber firms in same wedge, refreshed monthly.
Encore advisors who have built CREST-accredited consultancies or shipped UK-regulated cyber products + closed FS / public-sector contracts, plus NAVIZIX AI for runway + accreditation-cycle projection.
Full workspace, every module. The cybersecurity firm playbook loads on day one. Cancel anytime.
