They were joined by Sir Cliff Richard who watched the action on Centre Court alongside a friend.

Pippa Middleton braved the temperamental British weather as she attended day One of the Wimbledon Championships.

Middleton put on a summery display in a pink and white off the shoulder dress which she teamed with white heels and a pair of sunglasses as she arrived at the All England Lawn Tennis and Croquet Club on Monday afternoon.

She was joined by her brother James Middleton who made sure to dress up for the occasion in a navy suit and tie.

The siblings, who are avid tennis fans, took their seats in the Royal Box at Centre Court to cheer on British hopeful James Ward as he took on Serbia's Novak Djokovic during the first round match of the men's singles.

Tickets for People's Sunday at Wimbledon sold out in just 27 minutes after a scramble that left many tennis fans frustrated.

A tournament spokeswoman said all 22,000 available tickets were gone by 3.27pm, having gone on sale on the Ticketmaster website at 3pm.

Demand far exceeded supply, with 111,000 people having made attempts to book.

Some who missed out complained about the online queueing system, with Londoner James Mc Namara writing on Twitter: "It'd be quicker to have a child and train him to be Andy Murray than wait in this queue for Wimbledon Sunday tickets." Wimbledon put 10,000 Centre Court tickets on sale, at £70 per person, with 8,000 £40 tickets on sale for Court One, and 4,000 ground passes costing £20 each.

Members and Wimbledon's debenture ticket holders will make up the rest of the crowd.