B3i Intelligence
Methodology

How we rank professional services firms

Our rankings are produced through independent research. No firm pays for placement, no firm buys a higher position, and no firm is included simply because they asked to be.

The ranking process

  1. 01

    Identify active firms

    We identify professional services firms operating in each location through a combination of professional body directories (FCA Register, Law Society, ICAEW, ACCA), Companies House, local business directories, and our own research.

  2. 02

    Apply category-specific criteria

    Each service category has its own set of weighted assessment criteria — published on every ranking page. For example, accountants are assessed on ICAEW/ACCA accreditation, sector specialism, and partner accessibility; marketing agencies on strategic capability, in-house production, and measurable ROI.

  3. 03

    Research each firm independently

    We research each firm's published credentials, professional registrations, client reviews, sector specialisms, team quality, and market reputation. We do not rely solely on information submitted by the firms themselves.

  4. 04

    Score and rank

    Firms are scored against the published criteria for their category. Rankings are assigned based on total score — not alphabetical order, not seniority, and not commercial relationships. We apply consistent scoring across all firms in the same category.

  5. 05

    Review and update

    Rankings are reviewed regularly to reflect firm changes, new market entrants, and updated research. We welcome corrections from firms and third parties and review all flagged inaccuracies promptly.

What we don't do

Ranking criteria by category

These are the criteria we apply when assessing firms in each service category. All criteria are equally visible on each ranking page.

Accountants

  • ICAEW or ACCA accreditation
  • Sector specialism depth
  • Owner-managed business experience
  • Proactive tax planning
  • Client retention and reviews

Solicitors

  • Law Society accreditations
  • Specialism depth and breadth
  • Partner-led service
  • Client satisfaction
  • Local and regional reputation

Financial Advisers

  • FCA authorisation
  • Chartered Financial Planner status
  • Independence (whole-of-market)
  • Transparency of fees
  • Client retention

Mortgage Brokers

  • Whole-of-market access
  • FCA authorisation
  • CeMAP or equivalent qualification
  • Response time and communication
  • Client reviews

Management Consultants

  • Proven methodology
  • Sector and size relevance
  • Case study evidence
  • Senior consultant involvement
  • Post-engagement support

HR & Recruitment Firms

  • Sector specialism
  • Permanent and contract capability
  • Screening rigour
  • Fill rate and time-to-hire
  • Post-placement retention

Marketing Agencies

  • Strategic vs. tactical capability
  • In-house vs. outsourced production
  • Sector experience
  • Measurable ROI
  • Client portfolio quality

SEO Agencies

  • Technical SEO depth
  • Content strategy capability
  • Link acquisition approach
  • Transparent reporting
  • Proven ranking outcomes

Digital Marketing Agencies

  • Paid media expertise (Google, Meta)
  • Analytics and tracking rigour
  • Creative capability
  • Multi-channel strategy
  • Transparent ROI reporting

Web Design & Development Agencies

  • Design quality and UX
  • Technical stack and performance
  • Mobile and accessibility standards
  • CMS flexibility
  • Ongoing support offering

IT Support & MSPs

  • Response SLA
  • Helpdesk and on-site capability
  • Cyber security provision
  • Microsoft/cloud certifications
  • Contract flexibility

Insurance Brokers

  • FCA authorisation
  • Whole-of-market access
  • Commercial lines expertise
  • Claims support track record
  • Local knowledge

Community ratings

Alongside editorial rankings, our platform collects anonymous community ratings from users who have experience of professional services firms in the region. These ratings (1–5 stars) are collected separately from our editorial rankings and displayed alongside them.

Community ratings do not influence editorial ranking positions. They are rate-limited to prevent manipulation (one rating per firm per user per 24-hour period). IP addresses are hashed before storage and never retained in plain form.

Is your firm missing from our rankings?

If you represent a professional services firm in East Anglia and believe you should be included in our rankings, please submit your firm for consideration. All submissions are reviewed against our criteria independently.

Submit your firm →