u/Evening-Juggernaut50

Hi! Family of 4 (mom, dad, and girls ages 7 and 11) will be landing at LHR for a 20 hour layover. We land at 6:00 PM on a Thursday and fly out of LHR at 2:00 PM on Friday. Do we have time for a quick tour of the city? If so how would you suggest going about doing it? I wanted to book an easy hotel as well, close to the airport. I plan to check our bags all the way through to the US, so we would only have our carry on bags to make things simpler.