Finisterre -> Santiago bike transport

As mentioned elsewhere, I plan to cycle from the UK to Santiago this summer. Having gone that far it would be silly not to carry on to Finisterre.

I should be able to cycle form Santiago to Finisterre in a day and still have time to look around, etc. Ideally, I'd like to get back to Santiago that same day, allowing me to leave my luggage in SdC and make my overall trip one day shorter.

Does anyone know if local coaches would take a bike? Is there, perhaps, a special 'pilgrim service' taking people from SdC to Finisterre and back?

Any guidance is greatly appreciated.