Who Am I?

Have a look at the ten clues given below and see if you can work out who our latest mystery celebrity is

01 I was born on 9 January 1943.
02 My real name is Frederick Leslie Fowell.
03 In the early 1960s I was the lead singer in the 'Mersey Beat' pop group.
04 I shot to fame in the 1970 Royal Variety Performance.
05 I owned a horse that won the Grand National.
06 I appeared on the TV show Celebrity Fat Club.
07 My wife is called Donna.
08 I was an acquaintance of the Beatles.
09 I have taken part in Celebrity Wife Swap.
10 I am a singer, comedian and impressionist.

Good luck with this mystery celebrity.