Just looking at changing my gas & electricity supplier as suggested by Martin Lewis and remembered this post from last year.http://www.hotukdeals.com/deal/49159/british-gas-intros-new-cheap-tariff/
I signed up with British Gas (against my better judgement) last April and was happy to get the £40 quid via Quidco plus another £80 via the above post.
I've just gone through Quidco again and upgraded to Click Energy 5 Dual Fuel and another £60 has already been validated and is due in April.
All being well, that'll be £180 back from British Gas in less than a year and I'll look at switching suppliers sometime in April/May once Quidco comes through.
Hope this helps