Just seen reference to Scilly Isles on another thread (living by the sea) and had a quick look at pictures- it looks like heaven... please tell me about the practicalities though 
Where is best to go for access to beaches? My 2 are 2 and 5, so will probably spend all day on the beach tbh. How do you get from the main island to the others, as there appear to be 3 campsites, but only 1 on main island 
Is the sea warm enough for swimming at all?
There appear to be no cars permitted passage over there... so how do you manage to camp?
I know you don't need passports, but ID is required it seems- what can you use for small children?
We have 2 small children (too small to carry any gear!) and usually just throw stuff in the back of the car. We are already very minimalist campers, we have a 3.5 man tunnel tent, no chairs/tables or anything, 4 sleeping bags, 4 thermarests, couple of blankets, 1 ring-burner stove, clothes and food... I am struggling to see how I could condense it really. They would need beach gear too, but I'm guessing portable BBQ is out?
Are there places to eat out fairly close by? Are they horrifically extortionate or fairly reasonable?
Sorry- so many questions, but I am very excited as it looks unbelievably beautiful there, and I had almost given up on a beachy type holiday this year (weather in UK, and DD's passport expired).
TIA