Slots
IAT traffic that wished to use airways was regulated . On sector 23[G1-Bristol sector ] the rate was six per hour; those were six slots that had an impact on Heathrow/Gatwick/Stansted/Luton/Bristol/Cardiff/Lyneham/Brize Norton/Filton/Southampton/Bournemouth traffic for example. There is only so much capacity and if it is taken up by airshow traffic then there is none left for other users. Anyhow don't plan to use any of the west end sector airspace [Bristol/Brecon/Strumble/Berry Head/Lands End] on Wednesday night as it may be closed.