Good to go
All sound decent places to visit, but you shoukd be aware that Shoreham is very expensive landing fee. You can get a reduction if you upload enough fuel and arrive before (I think) 10.30 - but not sure if that helps a Jab.
Duxford has various "safety days" when you can get reduced landing fees.
Old Warden is free to land, and superb museum (and decent cafe).
Never worry about capability of going anywhere - if you don't try, you never will, and none of them are Heathrow. Just enjoy......