If you've an interest in the LU or even just in urban exploration, I can heartily recommend the Hidden London tours which give access to closed and abandoned tube stations/tunnels. I've been to 3 of them and they've all be fascinating. You can top it off with a visit to Acton depot which has an amazing quantity of LT artefacts and all are staffed by knowledgeable and interesting volunteers. Tickets aren't particularly cheap, but the visits are priceless.
https://www.ltmuseum.co.uk/whats-on/hid ... e569f43411