Okay that isn't as small as I first visioned.
My
route would be
West Coast of Scotland,
East Coast of
Ireland, Cornwall, North then South Brittany, Santander, La Coruna, Cape St Vincent, Gib.
The Scottish Western Isles as I am sure you are aware are just magical. Equally the Eastern side of Ireland has some real gems, so don't rush.
Once you're in
France the cruising is very nice so again don't rush and a cat will be easy to
anchor or dry out or see the Gulf of Morbian.
Portugal and Rias also worth stopping along
route.
You could spend a whole season just getting to Gib and have a great time on route.
Pete