Zak Starkey has been forced to cancel his performance at the last minute following a health scare. The son of Beatles icon Sir Ringo Starr had been due to perform in London on Tuesday night. However, he had to pull out of the gig and was rushed to see medics just hours before due to a blood clot in his leg. Zak, 59, and his band Mantra of the Cosmos were due to play a secret gig in Soho yet doctors immediately put the drummer on bed rest. The musician, who has performed with Oasis and The Who,