Micka,
I just managed to pull this off (outside Dublin) a few months ago. I was able to get an agent on the Banks panel to confirm to the Bank that the property was worth a higher figure than the sale price (the argument may have been that it would be worth X amount more after we put did up the house - not sure). It was based on an agreement I reached with the Vendors agent (i.e. he put me in touch with a "Pal") prior to buying. Good to see the Celtic tiger hasn't killed off the old ways of business (at least outside the Pale) yet ! Good luck !