Thames Valley Police announced a raft of security measures already in place, including road barriers and number-plate-recognition technology ahead of the big day.

The couple spent 30 minutes greeting hundreds of well-wishers who were undaunted by a sudden downpour of rain.

Kensington Palace said all those invited to the May 19 ceremony at St George's Chapel, Windsor Castle, his grandmother Queen Elizabeth's home west of London, would also be invited to the lunchtime reception afterwards.

Britain's Prince Harry is engaged to his US actress girlfriend Meghan Markle with the marriage due to take place in the spring of 2018, his father Prince Charles announced on Monday.

The opening of City Center Rotana Doha is expected to set new standards in Qatar’s hospitality sector, an industry official has said.