Don't know about now, but I would be very surprised. I spent Xmas 91 in sunny Colchester and I can assure you we were not allowed out, even to go carol-singing.
We did get Christmas dinner (including ONE can of lager) and I think we watched a movie, but that was it for the festivites IIRC. I've had worse.
The Maypole pub just down the road has a nice Christmas menu so when your in the exercise yard if the winds in the right direction you might get a whiff. I might go on Christmas day if its open so if you can do a Fletch off of Porridge and escape for the day Ill buy you a pint.