As no one else has answered.
I was there in May and seemed to be busy but it's big and with alongside berthing on the public quay and the sizeable marina it hard to see it being full for winter.
Maybe just ring, almost all the office staff have good English.
Thanks - had called and the said they would get back but never did. Found somewhere else which looks good anyway. Just been in Ayamonte (bumpy exit after rain!) and now in Chiponia. Both have plenty of space and UK and other boats arriving for laying up afloat. Ayamonte nicer, I think.