I'm slightly surprised they put it back a week. The 'normal' September show has normally been the first full weekend in the month, around the 6th or nearest to it, although this was also moved back last year - which messed me up no end - and din't have the Autumn, 'end of season' show, normally in mid October
I can only think that, in trying to get it as close to 'Battle of Britain Day' as possible, perhaps it clashed with other major events, so it's been moved even further into the month?
I'll keep monitoring the web-site - once tickets go on sale, then those dates must be confirmed. I hope so, as then I can book the camp site. Not as critical as booking accommodation for our overseas visitors, but important enough, with the crowds expected at this event.
My concern is, even putting it back one week, risks moving into the zone of poorer weather. Let's just hope we have a reasonably good summer, extending to late September !