Prisoners get the Vote?

So should Prisoners be allowed to Vote? Why not?

Let me see don't you have to be registered on the Voters Roll? So shall we see thousands of Prisoners happy to tell the world what their residence is? Derek Slasher Brown, Wormwood Scrubs, John Light Fingers Jones HMP Wakefield, etc etc. I can't see it somehow.
It would be good for Politicians, I don't the mean the Jailed ones, I mean canvassing at election time would be easy. Where else would you have a truly "captive audience"? and no chance of the door being slammed in your face or them running away!! It might be good in the sense that Prisoners would be able to tell their stories to politicians, they would see what its like "on the inside" - though there are a few MPs inside now (they are often called a bunch of crooks anyway) so why shouldn't crooks also be able to Vote for them? isn't that fair?
Oh and while they're at it now they can Vote and have a residence why don't they pay Council Tax.
What else is there, let me think.....?

Oh yes, how do they get to the Polling Station?