What to do outside of Heathrow or in London for a long layover?

Posted by Connect-Relative8481@reddit | AskABrit | View on Reddit | 39 comments

Hello, my husband and I will be going through a 19 hour layover in Heathrow before returning to the US. We will arrive around 5 something in the evening and flying out at 12 the next day. Is it worth going out to central London for the night or its best to stay around the Heathrow area?