I would like to say first off that I loved Green Street, so felt I had to watch Green Street 2. However, I would rate Green Street 2 as one of the worst films I have ever seen. It was clearly made by Americans and Brit expats who have forgotten what England looks like and didn't bother to do any research.
The prison sets are clearly all American and bear no resemblance to a British Prison, the weather is constantly sunny (very un-British) and the portrayal of prison guards is about as far from realistic as Jimmy Hill playing Hulk Hogan in a biographical film.
About the only positive thing I could say is that the casting of McTavish as the Millwall head guy was really good, but he was given nothing to work with.
I just hope that they can forget this film ever happened and maybe one day we will get a sequal worthy of the first film, with a decent budget, authentic locations, a much improved script and the return of some of the better characters, such as Tommy Hatcher, Bovver and The major.
I couldn't recommend this film to anyone, but I don't think you can understand how appalling it is until you watch it. So don't buy it, just borrow it from one of your mates who was mug enough to buy it, like I was.