U1 would have had about 150-200 in out of about 500(300 are sold in local general sale and a few will have gone in 13+ sale). U9 will have had about 100 in, possibly more as it also has about 500 tickets in total. 222 is a small block, so it probably only contained about 80 seats (back 2-3 rows plus singles). 129 probably around 100, as nobody would choose to sit in the back few rows if they could sit elsewhere. The other blocks wouldn't have had many tickets. I added multiple tickets to my basket at the time and vaguely remember what I was given, so that's what the estimation is based upon. Could be very wrong with my figures, so maybe there were less than 1000.