I personally feel that many of my fellow reviewers are getting the wrong end of the stick somewhat regarding this movie. Comedy is always subjective and when thrown together with fantasy it can be a recipe for disaster.
This film however had me in stitches from the start "guvnor".
Set in an alternative dimension where prisoners in "English" prisons play soccer tournaments to while away the hours unlike the dimension in which we all live where they're locked up 23 hours a day there are high jinks aplenty.
Wonderfully cast by "Dick Van Dyke associates" the film revolves around the Green street gang a band of lovable sociopaths unfairly banged up for crimes they did commit although probably Thespian in origin and their trials and tribulations up against a Millwall "firm" determined to show them their place in society.
Reading into the making of the film I notice that the writers and director studied the brutality of the penal system by watching hours of "porridge" and by jingo it pays off , there's bent screws aplenty and a wonderful central performance as chief warder from Marina Sirtis ex Star trek no less who manages to pull off a wonderful character not unlike the wicked queen in Snow white crossed with Hilda Baker.
Filmed for added reality in America , it's a testament to the makers that they managed to find such a wealth of genuine cockney actors , some of whom may even have heard of Prison, football or London.
One down point for me is the casting of Ross McCall, why oh why did they not just pay the extra ten bob and get in Joe Swash instead of this "lookey-likey" it really spoilt the feel for me.
Anyway file under C for Comedy and you should be AOK.