My feeling would be unless you get 'prime' spot - centre of the display line ( marked by a big orange mark on the cliff) on the edge of the no entry zone the best bet is just off to each side of the no entry zone on the outer edge .
Here aircraft have to go directly over head .
From Xch harbour you really wont see much apart the arriving and departing aircraft into Bournemouth so definitely come right along to the piers ( Bournemouth and Boscombe)
I'll be going out of Poole late morning/ early afternoon.
Weather looks to be holding..
if anyone is out come and say hi or call on Ch16 - 'Streaker'