Mark 12,

It’s fairly obviously a display of turrets in front on your first picture, with a nose section (Lanc?) to the left. But what on earth is the thing in front of that, looking like an oil drum with windows?

Adrian

That oil drum is a Leigh Light lying on its side.

Regarding cleaning, IWM have a couple of conservation assistants at Lambeth who have to go up in the gondala that normally lives up in the top of the roof of the atrium…apparently the Camel 2F.1 and B.E.2 tend to swing a bit when you go near them with a brush! 😮