An item on the BEEB today has some related material. For anyone who has low enough temperatures and young children the bit about bubbles may be of particular interest. https://www.bbc.co.uk/news/world-us-canada-68012886

Simple experiment: Take one home for a few days, keep in a warm dry place such as your living room for 48 hours, then 48 hours in a cooler damper place such as your car boot or garden shed and note any changes.

Of course you could always go for something different.

Try Westminster

Pass, if you've watched it, you know as much as I do about it. As usual it was not what I was looking for, just another of those distractions that slow you down when looking for something specific.

The new BBC archive of film clips probably contains several items of interest to those interested in mines/caves or in this case a well (a water mine?). Hopefully I'll get the link right. 1979 Archive film That seems to work, have fun seeing what else is there to be dug out.

Could be a bit harsh on the clubs if you get into the rough.

https://www.bbc.co.uk/news/uk-wales-56884631 Just appeared, time will tell how widespread this will be.  In the short term probably best to do a bit of checking before coming into the wider area i.e. the area the 'average' tourist/day-tripper will be interested in.