Your TV has a SCART socket. So you can use anything from a plain "receive only" Sky box through to the recording HD boxes. As long as the box also has a SCART socket then the TV and box can be connected.
If you take a box abroad with you to leave there permanently then you'll need to think about what kind of contract (if any) you want. A Sky box without a viewing card will let you watch a broadly similar range of channels to Freeview in the UK. There's a useful comparison guide here: http://www.ukfree.tv/allchannels.php
Used Sky boxes are available cheap from Gum and the Facebook selling pages, or have a look in your local classifieds.
If you buy a recorder box, remember that the recording and Live Pause features are only available with a Sky subscription. They don't work with an expired viewing card or no viewing card at all. If you think you'd like to record programmes while abroad then consider a Freesat PVR instead. It will cost more in the short term, but you will have the same kind of functions as a Sky recorder box.
One other option is TV via the net. There's a device called Slingbox. It uses the internet to port your home's Sky box signal to you somewhere else in the world. You don't bother with a second Sky box, just add a Slingbox digitiser to the home Sky box and connect it to your internet service. In Spain, you have a Slingbox receiver connected to the internet and your TV. What you've then got is control of the UK Sky box, and those signals sent to you in Spain via a web connection. You operate the Sky box in the same way you would at home. The difference is that the TV is 1500 miles away.
Slingbox relies on you having a decent internet service in Spain. That might not be practical, or possible, or even desirable. But if you want to have your full Sky package in a second location without forking out for a whole year's subscription then it is one solution that wiorks.