I can't remember the specifics but recently a title owner in Scotland, Laird Somethingorother decided to use his acres of land for such a purpose, but it was more of an open reserve, fenced in and the like but over a huge area. Last i heard of it, the proposal was being fought tooth and nail by landowners and farmers in the region.....
that is an idea proposed by the wolf trust. The Wolf Trust is a non-profit voluntary organisation for the understanding of wolves.
We advocate a revival of the natural heritage of the Highlands of Scotland through a reintroduction and recovery of wolves.
info on the proposed reintroduction of wolves in the uk
can be found here
you may also be interested to know they plan the same thing with the Eurasian Lynx
and the bear