He raised his eyebrows and tilted his head towards the frowning men who were now muttering to each other and looking at rather official papers. Ken had a fair idea what was going on, but that just seemed to bring out his devilish side. Instead of playing it safe and suggesting they leave, he started playing 'London Calling' by the old Muggle punk bank the Clash, giving the officials a musical version of the finger.
"London calling to the faraway towns Now war is declared - and battle come down London calling to the underworld Come out of the cupboard,you boys and girls London calling, now don't look to us..."