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I’ve had the following conversation at PubCon at least three times:

US affiliate: “British affiliate, huh? Bet there’s no competition out there…”
QN: “Well, actually it’s pretty competitive, just like the US.”
US affiliate: “…sure it is, sure it is. Can you suggest some UK networks?”

So here’s a list of the major UK affiliate networks, in alphabetical order. I’ve worked with all but a couple at one time or another.

Different networks work for different affiliates, so use your own judgement.

affiliatefuture.co.uk	Affiliate Future 5th Floor Threeways House 40-44 Clipstone Street London W1W 5DW Phone: 0207 927 8112 Fax: 0870 762 1826	Many SMEs with a particular focus on travel merchants.
affiliatewindow.com	Affiliate Window Digital Window Ltd 100 Leman Street London E1 8EU Phone: 020 7553 0425 Fax: 020 7488 2515	Big brands (eg, B&Q, Woolworths) through to SMEs.
altogetherads.com	Altogether Ads 60 Great Portland Street London W1W 7RT Phone: 020 3128 8600	New affiliate network, part of Altogether Digital & the Engine Group ad agency.
buy.at	Buy.at Cathedral Square Cloth Market Newcastle upon Tyne NE1 1EH Phone: 0191 241 6500 Fax: 0191 241 9302	Now owned by AOL’s Advertising.com.
cj.com	Commission Junction Oxford House 182 Upper Richmond Road London SW15 2SH Phone: 020 8785 5870	The world’s best known affiliate network also operates in the UK.
dgm-uk.com	dealgroupmedia UK Ltd Unit 800 Highgate Studios 53-79 Highgate Road London NW5 1TL Phone: 020 7943 4200 Fax: 020 7943 4215	Deal Group Media UK recently separated from the parent public company. Lots of broadband providers.
linkshare.com	LinkShare UK 130 Shaftesbury Avenue London, England W1D 5EU Phone: 020 7031 0950 Fax: 020 7031 0957	UK office of one of the other US big three.
omguk.com	OMG Services Ltd. 47-49 Colegate Norwich NR3 1DD	Huge number of finance affiliate programs, plus more retail merchants.
paidonresults.com	Paid On Results Limited Olympic House 142 Queen Street Glasgow G1 3BU Phone: 0141 222 4890	Consistently popular with affiliates, in part due to ‘on demand’ payment terms.
silvertap.co.uk	Silvertap Ltd 18 Meridian Way Meridian Business Park Norwich Norfolk, NR7 0TA Phone: 01603 595 000 Fax: 01603 431 143	Lots of programmes for Tesco finance.
tradedoubler.co.uk	TradeDoubler 24th Floor, Portland House Bressenden Place London, SW1E 5BH Phone: 0207 798 5800 Fax: 0207 798 5801	The behemoth of affiliate networks in Europe, with many big British brands on board.
webgains.co.uk	Webgains UK Dragon Court 27 - 29 Macklin Street London WC2B 5LX Phone: 0207 269 1230 Fax: 0207 269 1249	Huge range of SMEs in a staggering range of niches.
zanox.co.uk	Zanox Ltd 25 - 27 Shaftesbury Avenue London W1D 7EQ Phone: 0207 851 5814	Huge network in europe, less so in the UK.