Just received the latest newsletter through from Martin Lewis' excellent moneysavingexpert site. Apparently a hotel broker called Splendia are offering £50 cashback through the cashback website Quidco if you make a booking with them. So if you book a room for less than £50, you walk away with a free night (or nights) and a profit!
Thought it might be useful deal for any UK residents (I presume you need to be so as Quidco's a UK site) looking to book accommodation soon. Get it quick! And make sure you read the full terms and conditions. You can read what Martin Lewis says about it here
Hope that helps!