McCartney and Mills to separate

Former Beatle Sir Paul McCartney and his wife Heather Mills are to separate after four years of marriage.

A joint statement said they had "found it increasingly difficult to maintain a normal relationship with constant intrusion into our private lives".

Sir Paul and Mills, a former model, married in June 2002. They had a daughter, Beatrice, a year later.

They met in 1999 through Mills' work for her charity, launched after losing a leg in a motorbike accident in 1993.

BBCi