The more I think about it the better it looks, water was never a prob anyway, heat still, solar still, there's a ruddy great platform on top of all of those forts, will dig out some pics, perfect for barbies in the summer and with growbags, perfect for growing veg too, the places are natural reefs, loads of lobsters, crabs, shellfish from rope lines and nets, fish of all descriptions.
Loads of high quality protein which everyone on land will be gagging for, easy to barter that for veg, carbs and fuel, come in once a week, once fortnight/month, drop off loads of fresh fish, go back out. Easy to defend, can see a boat coming for miles but they can't see you in amongst those towers even on radar. Perfick
And not forgetting that seaweed is packed with vits and minerals anyway and all edible.
It's a few miles from the biggest wind farm on the Kent coast so good to have a few wind turbines for power too.