Foundations
Part of What should buyers know about marketing agency foundations?
Seven measures for sizing England's marketing agencies market
How fee income, billings, headcount and other measures can build a defensible range for England’s marketing agencies market size.
What to take away
- No official body publishes an England-only market size for marketing agencies. You assemble one from a company count and a fee income figure.
- Use fee income as the headline measure. Billings carry media and third-party spend that passes straight through the agency.
- Publish a range, not a point, with the method, the year and the named sources written next to it.
- Scope moves the answer more than the data does, so two defensible England estimates can differ by a factor of two.
- The inputs come from the Companies House register, ONS business services data and sector reports, each on its own update cycle.
Why England has no single published market size
Industry codes bunch advertising agencies with market research, so a ten-person search shop and a network media buyer sit in one population. That grouping decides your denominator before any number appears.
Geography splits the registers too. Companies House keeps separate registers for England and Wales, Scotland, and Northern Ireland. An England count therefore means filtering by region rather than reading a national total.
ONS publishes its business services series on a UK basis, which makes the ONS business services data a benchmarking input rather than an England figure.
Agency income is normally quoted net of VAT, and the Value Added Tax Act 1994 is the statute behind that treatment. Mixing gross and net figures inflates estimates quickly.
Define the scope before counting: the category boundaries for England agencies show which suppliers belong in the comparison.
The seven measures that build an England estimate
Seven measures do different jobs, and each draws on a different input.
| Measure | What it counts | Input source | Refresh |
|---|---|---|---|
| Fee income | Revenue the agency keeps after media and third-party pass-through | Agency accounts, ONS business services | Annual |
| Billings | Total client spend handled, including money forwarded to publishers | Agency accounts | Annual |
| Headcount | People employed on agency work | ONS employment data, register filings | Annual |
| Company counts | Live businesses under advertising and market research codes | Companies House register, filtered to England | Rolling |
| Revenue per head | Fee income divided by headcount | Derived from the first and third rows | Annual |
| Addressable share | The slice an agency of a given size and specialism could serve | Client budget data, sector reports | Annual |
| Client budgets | What buyers plan to spend with agencies | Client-side surveys, sector reports | Annual |
Seven Measures of Market Size
- 1Fee income from filed accounts
- 2Billings show scale not revenue
- 3Headcount from accounts or statistics
- 4Company counts by region
- 5Revenue per head billing ratio
- 6Addressable share of spend
- 7Client-side budgets fund demand
Match the measure to the decision in front of you. Pricing work needs revenue per head. A competitor count needs live company numbers in England alone.
For a benchmark you intend to reuse, record the scope, year, sources and calculation so the estimate can be rebuilt.
Example: building an England range from two inputs
This walk-through produces an England range rather than quoting a borrowed headline.
- Count live companies registered in England under the advertising and market research codes, and strip out dormant entries. Date the extract.
- Take mean fee income per head from ONS business services data for the latest full year. Label it UK-wide if it cannot be split.
- Multiply the two inputs to reach your England fee income estimate.
- Flex each input by 20 per cent either way. Two inputs moving together shift the product by about 44 per cent.
- Report the low and high case, with the year and both sources beside them.
A range you can rebuild from named sources survives scrutiny. A single number lifted from a headline does not.
Comparing England with Scotland, Wales and Northern Ireland
Published statistics rarely split the four nations at agency level, so build each one the same way.
Business support is devolved. Enterprise agencies in Scotland, Wales and Northern Ireland run their own grant and skills programmes, so a Belfast agency can face a different cost base from one in Leeds.
Company registration and advertising self-regulation stay UK-wide, which keeps cross-border comparison possible.
England vs Devolved Nations
England
- Business support
- UK-wide?
- Grant programmes
- Westminster
- Skills programmes
- Westminster
- Company registration
- UK basis
- Ad self-regulation
- UK basis
- Cost base
- Leeds example
Scotland
- Business support
- Devolved
- Grant programmes
- Own
- Skills programmes
- Own
- Company registration
- UK basis
- Ad self-regulation
- UK basis
- Cost base
- Different
Wales
- Business support
- Devolved
- Grant programmes
- Own
- Skills programmes
- Own
- Company registration
- UK basis
- Ad self-regulation
- UK basis
- Cost base
- Different
Northern Ireland
- Business support
- Devolved
- Grant programmes
- Own
- Skills programmes
- Own
- Company registration
- UK basis
- Ad self-regulation
- UK basis
- Cost base
- Belfast example
Where the inputs come from
The Department for Business and Trade publishes the annual Business Population Estimates, which give business counts by region.
- Companies House register: rolling updates, region filter, dormant flag.
- ONS business services: annual fee and output context, published UK-wide.
- DBT Business Population Estimates: annual counts by region and industry.
- Sector reports from trade bodies and agency networks: annual client budget data.
Once the size is settled, assess which part of the market you can serve; the commercial opportunities depend on that choice.
Common questions
Does market size include media spend?
No. Media budgets pass through to publishers. Fee income is the part that stays with the agency, and mixing the two inflates a market fast.
Can any official source give an England-only total?
Not at agency level. ONS and DBT publish UK or regional business counts, so the England figure is built by filtering and multiplying.
Which measure should go into a business case?
Fee income for market value and pricing, live company counts for competition. Name the measure in the same sentence as the number.
How often should the figure be refreshed?
Annually for fee income and headcount, because the underlying series update each year. Rebuild the company count whenever you run the exercise.
