Hi Chaps,
Thank you for your replies. I spent a good portion of the day checking for flights out of Bilboa to London and even Barcelona, but they seem pretty full or very expensive, thus the best option for our dates was to buy a round trip from Madrid.
We will have about a week between our flights to and from Madrid back to the UK, however we need to be in Madrid for the first 3 days, thus have another 3 days at the back end to travel elsewhere and come back to Madrid.
We will look into the San Sebastian option for sure, maybe take the bus or train.
On a different note, any suggestions for a good, safe, 4 or 5 star hotel in Madrid? I have some status with Starwood, not the highest, but the Westin seems expensive.
Thanks!
Andre