Cliff Richard says he 'still worries about selling tickets' ahead of 75th birthday gig

Sir Cliff Richard has admitted that he still worries about selling tickets to his shows, ahead of his 75th birthday tour.

The singer, who will play at eight venues around the country before performing a six-night stint at the Royal Albert Hall, said that he "still wonders if anybody's going to show up".

In an interview with BBC Radio 2's Paul O'Grady, Sir Cliff said: "When you start your career you have no concept about longevity, for me you don't know what's going to happen, so how it's gone on I've no idea.

The 74-year-old has already played 32 sold-out concerts at the Royal Albert Hall, where he will perform again on his birthday in October.

He told O'Grady that he has "invited a whole bunch of people", including showbiz friends, to the gig despite usually trying not to work on his birthday.

"I'm just going to work on my birthday and normally I try not to do a concert actually on my birthday but this time I thought what the heck, you know, I'm 75 and so I'll do my birthday night there," he said.