Whats the Tank / Gun ?

[Steeleye]

Sorry for being a bit picky but its #pdr not #lb-er or whatever.

As in 2pdr, 6pdr, 17pdr and so on.

The middle picture looked like a German Pak 50mm with a British crew to me but I might be wrong.

[Duke Speedy of Leighton]

That was my I total thought, but then I looked under the barrel and at the top of the gun shield and that's definitely a six pounder.