I have done pretty well with Eurobet – but only manage to sign up bonusplayers. They offer a pretty descend monthly match bonus.
…also Coral.co.uk have been okay – you can sign up with them through brandconversions.com – same group as Eurobet – but different affiliate system.
Theres also VC Casino – a really big english bookmaker is behind. They have a big sign up bonus – but i haven´t had any luck with them.