I know the regulations have changed in the uk. Irish banks used to do alot of lending for uk properties (our rates are much lower so it's cheaper to borrow here) But the UK equivilant of our financial regulator brought in new rules that you must be regulated to sell a mortgage in the UK. This means that Irish mortgage advisors could no longer advise on UK mortgages. Irish Banks for the most part have UK counterparts (with the exception of PTSB) so your own bank could probably arrange for a qualified.regulated Mortgage adviser to look after the paper work for you...that does still mean it'l be on UK rates....
I''m about 99% sure about this but check it out anyway, stranger things have happened than me being wrong.