Ruth Watson returns to Cothay Manor, Somerset, a 15th-century building full of original features, to see whether owners Alastair and Mary-Anne Robb's ambitious plans have provided any financial dividends. The Robbs bought the country estate 15 years ago but have never made a profit. Their project to transform the surrounding area into an sculpture park is still to materialise and they now have the added problem of deciding which of their four children will inherit the property and its million-pound tax bill.