Hargreaves99. I think like many of us there was an assumption that there would be some kind of reciprocity between UK and EU in terms of licensing but sadly that is not the case. The UK has agreed to allow EASA licences to be used to fly G-reg in UK but EASA will not now recognise UK licences that are now regraded as 'third country'. So as Variable Load said you are too late.
Also it appears that you cannot even attempt to convert your UK licence to an EASA licence as there is no such animal as a 'UK licence' at the moment until the CAA get around to issuing one. Meanwhile our EASA licensed friends can fly in UK for 2 years and then get a 'free' UK licence issued to them - and they get to keep their own EASA licence.