You silenced my worries about the narrow entrance. We will probably be camping the first day somewhere in Kent and arriving in London the next day. So it will be in daylight.
We have visited the National motorcycle museum twice in previous years Once on a Beemer, once with a Meriden Triumph. But long before the fire. Yes it was amazing. I think they have rebuild it by now.
For this year we plan to travel west. Halfway towards Lands End is the Sammy Miller Museum. I've never been there, been to Cornwall, eating scones, but not this famous museum.
So we are staying south: Kent, London, Oxford, Stonehenge, Sammy Miller
, Exeter/ Dartmoor, Penzenance and back. Maybe, depending on time and weather, a bit of Wales crossing at the Bristol channel, but not as far north as Birmingham.