I’m just replying to this to add that I managed to fit in some Open House visits on a short trip to London.
Last Saturday I visited the new City Hall, which is way east in the Royal Docks area. My sister came up for the day too, and we took the cable car from North Greenwich (by the Millennium Dome). We got chatting to the staff/volunteers about how they enjoyed working there.
On the Sunday I went to Drapers’ Hall, one of the livery halls in the City near Liverpool Street station. I love the fact that at 10.30am on a Sunday there was actually a queue to get in! I was joking with the chap behind me about whether were accidentally queueing for an Instagram-famous brunch place, but we decided there were so many grey haired people that we must be in the right place.
And then I did a little tour of Senate House, the huge 1930s art deco building in Bloomsbury that was the model for Orwell’s Ministry of Truth in 1984.
I love the Open House Festival - I highly recommend it.
And there are Heritage Open Days during the same time period all over the country - so if you happen to be in England during this time of year, it’s worth checking. https://www.heritageopendays.org.uk/