The sailings to Bilbao are stopping for a month from 10 February to 13 March whilst the Pont Aven and then the Cap Finistere undergo annual maintenance. If you have a choice of boats the Pont Aven is definitely the best.
You can see full timetables here
Portsmouth to Santander Timetable - Brittany Ferries
Portsmouth to Bilbao Timetable - Brittany Ferries
Some of the ferries leave late at night with two nights on board (no more expensive) and you then arrive early in the morning on the second day. Examples include the Portsmouth to Santander sailings on 16 and 23 February. If you take these you can get through Spain in one day and you save the cost of an overnight hotel.
Some information on routes through France, Spain and ferries to Morocco.
I've sent a PM with details of a 10% discount for Brittany.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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