I just received thisemail from Octopus travel:
1 in 10 bookings free
Book your hotel on loyalty.octopustravel.co.uk. at our already super-cheap prices, and youll be in with a chance of paying absolutely nothing! Call us crazy, but we are giving away every 10th booking made on our loyalty site. But hurry because this offer ends on 5 April!
I've booked with them before and the prices are usually pretty competitive to start with so worth a try if you are booking a hotel anyway :)