On Tuesday 10 July there will be a celebration of 100 years of the RAF flypast of 100 aircraft in London over Buckinham palace.
Details here Everything you need to know about RAF 100 Flypast | East Anglian Daily Times
NOTE - the times are British Summer Time which is GMT +1. Fingers crossed for good weather.
Could get some interesting flight tracks. I had 9 Chinooks and several Pumas in formation over my house the other day. They came from Benson airfield.