If you buy a new PPR (Principal Private Residence) for example with your fiancé then you have up to 12 months thereafter to sell your old one without any CGT implications. I am surprised that your solicitor and the EBS don't know this. If in doubt get independent, professional advice from an authorised/qualified tax advisor. Note that when buying jointly with your fiancé you will jointly be classed non first time buyers because you (at least) are not a first time buyer.