You could try booking a travelodge room quite cheaply.
I would check the review for the hotel on http://www.tripadvisor.com before you book though.
Also try http://www.londontown.com/hotels/ they give you good info on the hotel and also a discount. (again, check on trip advisor for reviews)
With over 400 hotels across the UK, Travelodge is a giant in the country's.All Travelodge Discount Codes and Voucher Codes for August 2017.INSTRUCTIONS: Working link: https://www.travelodge.co.uk/hotel-deals?cmpid=homepage~ . May 30 - Oct 29