Hi Viv,
If it's a new'ish digital TV then yes it should work. In the menu does it ask which counrty you are in? The digital system in Spain is the same as the UK BUT they use an extra channel (69?) so unless your TV can receive this you will not get all the available channels. If it's a analogue, then no as the system over there is different ( PAL I rarher than PAL B/G ).
But bring it anyway, as either way if you have problems you can get a TDT ( Spanish Freeview ) set top box to use via SCART for less than 30Euros.
As for the SKY box, I'm told by customer services that this should work once they have sorted out the connectivity, but still no idea when this will be .
My TV and SKY box have just started thier first leg of the journey out there with the in-laws, three weeks 5 days to go until my next visit
Phil