Similar situation with Sky. Apart from the FTA channels, it is not available outside UK and RoI - in theory. This is not so much Sky's restriction but their fulfilent of an obligation not to broadcast material outsde the area for which it is licensed. So if you use it outside, you have to go through the farce of using a UK address, not letting them know that you're outside the UK if you phone them etc.
I don't know what percentage of their viewers is outside the UK but I suspect it must be high - just about every English speaking family I know in Europe within their reception footprint (which with a 1m. dish stretches into central Europe and well into Spain and Italy) has Sky.