David visited Beaulieu House (The national Motor Museum, UK) in 1973. Sharron L worked with Lord Montagu of Beaulieu House to have David remembered there for his visit in 1973. Lord Montagu kindly offered to place an information board near the location on the riverbank where David went fishing with his mum. David later had tea with his mum, his sister also remembers the visit, but Lord Montagu was at boarding school at the time.
Further details and message from Lord Montagu here.