Thanks Suff
Blimey high speed and still takes 4hrs 40 mins. We would be staying in a cottage or similar so parking wouldn't be an issue. I had pretty much decided on Guernsey rather than Jersey simply because its only 3 hours.
However, I then went and google drove it and also my friend sent me some photos and yes the channel islands are beautiful but look just like Cornwall. So I thought why spend £400 on travel, and worry about it.
So we've ditched the Channel Islands and have decided to spend the £400 on luxury self catering as it was going to cost more than the UK for a holiday let.
We are looking at Northumberland now, as we loved it last time we were there and looking at the luxury holiday let market as it will cost less than the above
but thank you for all your advice