That looks very like an RASC that has been painted over on the tank. A fascinating picture - the rifles all seem to be the Lee Enfield No 3 mk 1, which would have been fine, but certainly not the modern No 4 rifle. I'm sure others (more expert than I am) will find other good details. I'm intrigued by that strange 'T' shape on the tool box....
Looks as if the censor also scribbled on the headlight. I wonder why...
Also noticed the T shape on the toolbox. Thought it was the shadow of the kickstarter... But when I look again, I think I'm wrong. No idea what it could be...