Alastair Grant/Getty Images Diane Dourish from Alnwick in the north of England attends a special picnic in the grounds of Buckingham Palace, ahead of the Diamond Jubilee, Buckingham Palace in 2012. Features in the south-west garden, including the Rose Garden, summer house and wildflower meadow, will be accessible via a daily guided tour that can be booked separately. The only other time anyone has been able to picnic on the Queen’s carefully manicured lawn was during a Diamond Jubilee event in 2012. To mark the occasion, chef Heston Blumenthal conjured up a five-course menu for 12,000 guests who had secured free tickets to a concert at the palace, which was all carefully wrapped and presented in a wicker hamper.