Treasured items collected over last 300 years to be sold by Castle Howard with total estimated value of £10million . Owners of grand country estate , which featured in Brideshead Revisited , selling antiques to help secure its future . Collection includes a £3.5m painting of Octavia 's Grand Canal by Bernardo Bellotto and £1.2m portrait of Henry VIII .
Treasured items collected over last 300 years to be sold by Castle Howard with total estimated value of £10million . Owners of grand country estate , which featured in Brideshead Revisited , selling antiques to help secure its future . Collection includes a £3.5m painting of Venice 's Grand Canal by Bernardo Bellotto and £1.2m portrait of Henry VIII .