Hi just_a_bloke
The below list might be useful, you'll need to Google for contact details. It's by no means exhaustive and doesn't include many mid-market to large company brokers...
you can also list your small business for free on
http://bizsale.co.uk
Adams & Co Nationwide (small businesses)
Abacus Day Nursery Sales
Addisons (estate agents / property companies)
Adepto Acquisitions Ltd (medium businesses)
Advent Business Sales Ltd (small businesses)
Albert Goodman LLP (medium businesses)
Alexander Mackie Associates (garden centres/nurseries)
Allan McLaren Chartered Surveyors (leisure companies)
Altius Group Ltd (small to medium businesses)
Anderson Moore (small to medium businesses)
Andon Freres Corporate Brokers Ltd (medium companies)
Apex Business Sales (retail/catering in South East)
Arthur-Wheeler (Isle of Wight)
ASG Commercial (hospitality)
Axis Partnership (UK) Ltd (small/medium in Suffolk and surrounds)
BCMS (small to medium / nationwide)
Beer Mergers (small businesses nationwide)
Benchmark International (mid market)
Blacks Business Brokers (Manchester)
Bridgers Central UK Ltd (West Midlands)
Bruce & Company (Scotland)
Business 2 Transfer (Scotland)
Business Partnership (nationwide, all business sizes)
Central Business Agency (small businesses, commercial property)
Central Business Sales (small businesses, central Scotland)
Chaplin Bond Business Sales Specialists
Charles Darrow (western counties)
Cherry & Cherry (Devon)
City Business Brokers (Birmingham)
CMC Partners (small/medium businesses)
Colliers International (national, strong on hotels)
Chelsea Corporate (medium)
Cornerstone Business Sales and Valuations (Scotland)
Corporate Mergers (deal value 500k - 10m)
County Business Sales (nationwide offices)
Davey Co (small/medium)
Diverco Ltd (medium businesses)
Ellis & Ellis (mid country brokers)
Everett Masson & Furby (18 offices nationwide)
Evolution Complete Business Sales Ltd (Berkshire)
Falcon Commercial (Devon)
Fish And Chip Business Sales (North of England)
Fleurets (small businesses - nationwide network)
Fox Leisure (caravan / camping parks)
Franchise Sales & Resales
GPS Business Sales (south East England)
Graham + Sibbald (hospitality trade / Scotland)
Guy Simmonds
Hart & Co (Chester)
Harvey Silver Hodgkinson (north west)
Hornblower Business Brokers Ltd (engineering)
Humberstones (nationwide)
Humberts (commercial property)
Hurdley & Co (West Midlands)
Intelligent Business Sales (Manchester)
Kenrick and Co (commercial property / Lancashire)
Kings Business Transfer (nationwide)
Kingswood Business Sales
Langley London (value over 1m)
Lawrence & Co (dry-cleaning / laundrettes)
Leith Mergers & Acquisitions Limited (deals 500k - 10m)
Meridian Business Sales Ltd
Merrill Hays (nationwide)
Miller Commercial (small businesses / Cornwall)
Moores Commercial (commercial property / East Midlands)
National Business Sales Ltd
Nationwide Businesses Ltd
Pegasus Business Sales
Quinton Edwards (garden centres / horticultural)
Redwoods Dowling Kerr ( healthcare, childcare, retail, licensed / leisure)
Richmond Capital Partners Ltd (print/packaging/manufacturing)
Roses (fish and chip shops)
RS Business Transfer Agents (small businesses / East Midlands)
Sanderson Weatherall (nationwide leisure & commercial property)
School Transfer Consultants (educational)
Scott Burridge Commercial (south west)
Scottish Business Centre (hotels/pubs in Scotland)
Select Business Transfer (Manchester)
Sidney Phillips (Licensed trade / nationwide)
Smith & Clough Business Associates (leisure/retail, Glasgow)
South East Business Brokers (London & surrounds)
Sovereign Business Transfer Limited (Cheshire)
Stonesmith (hospitality / south west)
Sunbelt Business Brokers (small / medium)
The Business Exchange (Wales)
The Business Sales Agency (small businesses / Scotland)
The Rosewater Group Limited (letting agencies / property management)
Turner Butler (nationwide / small to medium businesses)
UK Pub Sales (pubs / licensed trade / nationwide)
Underwood Warmington (Devon)
Vandervells (SMEs)
Vexus (medium companies)
Ware Commercial (Devon & Cornwall)
Watkins Commercial (Sussex / Hampshire / Kent)
Weybrook Business Brokers (Surrey)