I stand corrected you are quite right... But silly thing, rightly or wrongly was sold as the sex pistols as was The biggest blow and the two Sid sung on, but as we know the horse was well on the way to dying after a good flogging by then !
No it was "the Sex pistols" it was part of the Great rock and roll swindle LP, The cover was a pop corn box with The sex pistols on it! The Professionls were a band with Phil Lynott.