We wll land early Monday morning at Heathrow terminal 5. We will take the tube to the Holborn station. Walk to our hotel, the Grange Holborn and store our luggage since I am sure our room will not be ready yet.
We will stroll over to the British Museum and wander through it for several hours. The cross the street to the Museum Tavern to have a pint or two and eat either fish & chips and / or bangers and mash. Then go down to Tea and Tattle for some afternoon tea and scones.
Then it should be time to go back to the hotel and check in. We are in our 69's and think this plan is doable and not too taxing on us.