Hi Simon,
I hate to be the bearer of bad news but I'd be highly surprised if you could find a suitable property for £30k, in fact treble that budget would probably be more realistic. Whilst property is a lot cheaper in Spain anything that seems too good to be true will be cheap for a reason. Also, the purchasing costs are approx 14%-15% of the purchase price in terms of taxes etc so you'd need to factor this in to your total available budget. Sorry to be the bearer of bad news, I think renting might be a better option so you're not locked in to something - property can literally take years to sell in Spain and buying something unsuitable, however cheap can turn into a very expensive mistake.