Brittany Ferries have a cracking deal right now of 20% off their motoring holidays if you book by 9 Dec.
We have a group of 3 cars booked on the Picos tour in June. https://www.brittany-ferries.co.uk/holidays/car-motorcycle-tours/spain/picos-de-europa
If you would like to join us please PM me. I must stress this is not an organised tour, you are booking it yourself direct with the ferry company.