For people in the same/similar position as Ski, you might be interested in the following.
If Ski was preparing to marry her Partner she could sell the property in her name to him before they get married. The property would then be his to rent and there would be no issue in relation to stamp duty clawback. Careful however as this will give rise to stamp duty on the sale, but if the contract is stamped after the marriage there is no stamp duty between spouses. This occasion could also be used to remortgage your original property thus maximising the amount of mortgage interest relief one could set off against the rental income from the original property and use the money generated in the remortgage to finance the new house.