Thanks for that. I don't suppose the area of Spain you're in makes any difference to reception?
Currently:
If you can receive BBC Channel Island then you can receive BBC HD - they share the same frequency.
Many of the other HD channels (ITV HD, C4 HD, and the Sky HD channels) are split amongths the tricky to get "north" beams and the easier to get south beams.
So the north beam HD channels reception will be as per Sky 3 - that is also on a north beam.
The south beam HD channels reception will be as per Sky 1 (UK not ROI!) - that is also on a south beam.
BBC HD, ITV HD are free and require no additional subscription to view ON ANY HD receiver.
C4HD is free and requires no additional subscription to view - just a valid sky viewing card - either freesatfromsky or subscription.
All other HD channels require an extra £10 per month for the Sky HD mix - and it depends on which Sky package you subscribe to.