What is this tank?

[maple_leaf_eh]

Calling anyone who has chased around Salisbury Plain - what would codes painted on the vehicles mean?

As I was scanning the pictures, I spotted a few themes. Some vehicles are burnt and otherwise decrepit. Others are in green paint, or repainted to be highly visible. Most vehicles have a spraypainted code number too.

I have picked out codes like:
A, P, J, F, H, K
AM, AN, AG
W4
W74, W74/A, W176
etc.

Would the numbers identify West sector, "hard object" number 74?