Okay that isn't as small as I first visioned.
would be West Coast
of Scotland, East Coast
, 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.