Caught it by accident whilst flicking around the On-Demand thingy. Watched the one where he's recruiting in the shopping precinct after coming back from Iraq.
Apart from the fact that Gary is a bit camp for me, although they're spot on with him being a chubby Tank commander it's actually quite funny.
I found the episode I've mentioned quite believeable. The borderline lezzer female SNCO called 'Sgt Splitter' and the fact the the young trooper managed to shag one of the MOP in the disabled toilets. Pure class!
I will try and catch up on more but until this thread I thought it was a one-off.
Edited to add: I live in England and Virgin media run it.