But in our case the display area is the sea.....
I'm going to have to call BS on this.
As someone who spent a fair amount of time in Weston-super-Mud, having been posted to RAF Locking straight out of training, I can confirm that 'the sea' rarely makes an appearance in Weston, rather miles and miles of mud act as a poor substitute for all but the most fleeting of moments.
If the display area truly was the sea then the Red Arrows would have miles of space in which to reduce height without needing to pass over Weston at low level.