Hi, Umm you are moving to Spain and you think you'll miss English food lol lol lol, let me say that you are going to be able to enjoy one of the best and most healthy cuisines in the world.
Don't get angry for this comment I was just making some fun about Brit food ;-)
You wont have problems finding HP!!! just go to any supermarket big enought.I am really not trying to offend any British guy, but English food is known in Spain as a nightmare,let spanish flavours conquer your stomach for ever, if you are just a little open minded you won't be disapointed, trust me.