Thanks for the link. I wonder if O'Hanlon's know that there is a typo where it says 'natural, love and affection' on the first page in the section under the bit about the 2 brothers!
From this leaflet it sounds like in our case - where we weren't married and also don't qualify under the cohabitant's act - in the case of the house being in positive equity the stamp duty will be assessed on whichever is greater out of:
- half the value of the loan taken over
- half the equity of redemption (market value less outstanding mortgage)
In the case of negative equity the stamp duty will be assessed on:
- half the market value of the house
The house is teetering between neg eq and pos eq at the moment so hard to say which one it will be.