I suppose you will have to resort to the old fashioned method mate. But first, it might be worth sticking a stripping knife under the paper and trying to strip it dry.
Sometimes when there is a build up of paint, it all goes very brittle and needs no water.
If not, score the paper, to break the paint film, (making sure you don't gauge the plaster underneath), and brush on some very hot water with a squirt of Fairy Liquid in it.
Give it ten minutes to have a good old soak, and if you think it needs it, do it again.
Then get out the trusty stripping knife, and away you go.
The worst bit is starting, it's very demoralising.