Take A Twilight Tour Of The Tower | Londonist. These tours take place after the crowds are gone and are led by beefeater guides, I really wish we would have been in London late enough to take one of these.
The Kelpies, A Pair of Massive Stainless Steel Horse Head Sculptures in Scotland. We passed these will driving towards Edinburgh during twilight and since we weren’t expecting them it was a bit trippy. They are hugenormous.
“Scalper” ticket source for Stirling Castle Christmas events? | Ask MetaFilter. The advice here would apply to any UK events that you inevitably find out about too late.