London hotels are normally always extremely high-priced and we were seeing some ridiculous prices like GBP400+ even for three-star hotels, so we were lucky to find Heathrow Travellers Hub, which offered a reasonable stay not too far (about an hour out) from Central London.
Do not expect the Ritz Carlton but it has good wifi, hot water, and most pleasantly of all, was very clean. For that reason, do not hesitate to use it if travelling on a budget.