Hi,
Judging by the amount of eastern european plates around in Scotland.......I don't think it matters.....we have had quite a few in our small village for a couple of years now.....it also seems it doesn't matter if you have tax or not ???
And speaking to a local policeman, they leave them to it because it costs too much to get them interpreters and polish speaking lawyers etc......!
Something really needs to be done about it quite frankly !

We also get lots of tourists from Germany, Spain & Italy and they tour around for months........how legal it is I don't know, but there are lots so it might very well be ok for you for a couple of months.