Bananalotto.co.uk: Free online lottery with a daily chance to play for £1 million and other prizes.
Compaholics: Guide to a wide variety of online competitions.
Comps.org: Listing of currently valid UK competitions and winning slogans from previous competitions.
Dotcomper: Offer slogans along with what the latest competitions are and where to find them. Requires registration.
Loquax's Quick Picks: A collection of online competitions and prize draws.
MyOffers: Prize draws and online competitions - win flights, cars and money.
Prize Focus: Automatic UK competitions and prize draw entry service.
Tombola UK: Offering free to play, instant win games.
UK Competitions: Offering a range of competitions from cash to music. Includes winners board and members club.
UK Wins: A to Z listing of the best competitions in the UK with daily updates.
Winspiration: Competition tiebreakers: help, inspiration, ideas and past winning examples.