I do remember The Thmpson Twins fetching up for a gig in Newcastle - so they went to Newcastle-on-Tyne, but in fact they were booked to play in Newcastle-under-Lyme, which is about three hundred miles south of where they arrived!
I'v e been doing some research and it turns out firstly the Greenwich version is really called the O2 Arena, although most people call it the centre, and the one in Hampstead was named in error after the water flowing around the area, and was meant to be the H2O centre, built in 1998, before the O2 company was here.
Interesting story Andy, it must happen a lot in those sort of situations.