The change is posted for the 28th July, the Sunday the Airshow is on.
So it could be, i forgot about the Sunderland Airshow being on in July.
Here it is on VOSA.
PB0002400/492 - GO NORTHERN LTD T/A GO NORTH EAST, 117 QUEEN STREET, GATESHEAD, NE8 2UA
Variation Accepted: Operating between SEABURN WHITBURN ROAD and SILKSWORTH CHURCH VIEW given service number 99 effective from 28-Jul-2013. To amend Route.
RE: Go North East
Ooo Friend, Bus Friend.