peteinnewforset.....The P&O Portsmouth/Bilbao ferry is scheduled to run all year but it has proven to be problematic and is sometimes cancelled at very short notice, if there are adverse conditions in the Bay of Biscay.
I know this only to well. Last year our outward ferry was cancelled due to mechanical problems and this year, only 12 hours before we were due to leave home, it was cancelled due to bad weather in the bay. We had to make hurried arrangements to travel on the Dover/Calais route and drive down through France.
AT ferries have also stopped running this route altogether so we have decided that in future we will not risk this service for our outward leg.