hiya, retail eyes that someone has already mentioned and also retail active are quite good. i have worked for both before and still get the names mixed up as they are quite similar!!!
think i found those two on http://www.mysteryshopperjobs.co.uk/
a while ago but they dont seem to be on there any more. i am also a member of consumer intelligence who do telephone mystery shopping for about £40 a call. it's normally to insurance companies to get a quote from them and let the call be recorded.
sorry about the bad typing, have got a sprained wrist so struggling to type with one hand and doing capitals is a difficulty
hopefully i've posted this message correctly, first time i've used a forum