We always stay at a hotel near LHR the night before our early flights back to the US. You can enjoy a last day in Lodnon without worrying about getting to Heathrow in the early morning hours. WE use the Travelodge chain, sign in on their website, travelodge.co.uk, and get some really reduced rates, especially around LHR. We like Heathrow Travelodge Central, which isn't central at all, but is in a little neighborhood with a pizza place, an authentic Polish deli and market, pubs, fast food, etc. Most other LHR hotels have no options nearby and one is forced to eat the mundane hotel selections. We usually get a nice room for around 29 GBP on their special bargain sales. There is a Hoppa bus that starts at 0430 and stops at all of the hotels. It will get you to LHR in plenty of time. Staying near LHR takes all the worry out of a flight home since you are just minutes from the terminal and not fretting about getting to LHR from some distance away, not to mention the cost of a car service. Works for us.