We reckon they were hired by Jacko

Who else could be as low as to mug Jarvis Cocker and steal his glasses?

Talking of jacko, pyro pointed out that he'd been to visit Maurice Gibb in hospital (BeeGee no longer at death's door, by the way, but sort-of-round the garden gate) - presumably because its one of the few occasions he can wear a medical mask and blend in rather than stand out.