Anyway, the point is, there's the boss, donning his uniform in order to blend in with the Dave Brennan Jazz Band leading the disturbance. Pity he forgot his cap and tie - the chap with the saxophone has got his on. Sadly, Ian's upset the chap on the far left as well by the looks of things.
It all adds up now. Remember that time when he was spotted playing in the band at the Swanage Carnival? (you'll have to scroll to the very bottom)