doing surveys at e-Rewards.co.uk. Just thought i'd share the tip. £15 can be doubled to £30 at attractions, Pizza Express (this month), and of course when Sainsbury's runs it's double up promo. So well worth it if you have the spare time.
Note: i am registered as a small business owner (which i am when i'm not on maternity leave), and find some of the high value surveys (500 points etc) are targeted at business owners. Mind you i did a fun one on laundry detergent that was 600 points for 20 mins so just goes to show.