I would assume they would let you in. Ask the docent who stands out side the venue. They may let you in thru the exit

When we were there in the spring, this was not included as part of the London Pass. It is still relatively affordable, and well worth the price.

Para mi - minimo 2 horas, pero puede ser mas, dependiendo de su nivel de interes en la historia.

I would suggest booking as close to the time that you think you will be arriving. Or giving yourself ample time. If you have to wait a few minutes to be admitted, that is fine. You walk through on your own. And, depending on how big of a WWII buff and Churchill fan you are. Which, I am both. I would give myself at least 2 to 3 hours to go through and experience everything. Enjoy yourself!

No you didn't when we went.

You can buy then at the door though recommended “Buy your tickets in advance online for priority entry” - much quicker

I used the London Pass. On line in the US it offers tickets from 11-14 pounds

si possono fare anche al momento. Noi il 10 di agosto in tarda mattinata abbiamo fatto circa 20/25 minuti di coda