Now I know...

... why there was the word "Reserved" was chalked on the pavement outside Jame & John Graham's.

"Squeeze box" was apparently booked to play outside this a.m.

What's less obvious is the fact that they are raising money for a chap called Mark Harrington. 

I took a swift squint @ one of the relevant pages ... it said:-
"We've had a final count up from the busking on Saturday, and we're delighted to let you know that we managed to raise a grand total of £417 and one trolley token."