My husband has been left a 1/3 share in business premises with his siblings by his dad. The premises currently have commercial and residential use. If we were to sell our current home and use the proceeds to buy out the siblings and live in the premises -- would we have any CGT to pay at that time ... or in the future if we were to then subdivide the whole premises (where we would be living) to create a couple of flats which we were to then sell?