I would like to know why the airspace on the route of the fly past was closed from 0930z until 1130z. Well that was what the notams said for the area I was operating, and then be told that the RA(T) had been brought forward to 0920z and I would have to land and shut down. Could then not start again until 1140z due to a delay. I can understand the need to keep the route clear in the run up to, and during the fly past, but for 2 hours prior??? The airfield ATC and local radar seemed as bemused.....