I'd booked the flights way back. I didn't realise the hassle w/ Iberia and bike box.
Also, riding back with bike box.. um..
I'm just going to have a nice ride, see as much as I can (save the first night) and then depending on when I arrive will see what my options are.
It seems like a lot of faff to avoid flying back with Ryanair from Biarritz, sure getting home from Stansted takes less than the ferry
EDIT: you might as well cycle back to London at that point, two/three days and you should be home