Hi Keith, I really thought my fine was a scam, as other EOS members did. The fine arrived 3 months after the offence and I was very worried about points on my uk licence and whether I would be stopped hiring a car next visit.
I tried to find a way to pay from the UK but failed. Had to do it when next in Spain. Post offices in Spain seem very set up to deal with these fines - just punched in details and printed receipt. No problem hiring a car on next visit ,but it did mean having to pay the higher fine - not pleased, though thankfully NO points on UK licence.
If you know anyone in Spain, could you send them a copy of the document and ask them to pay it for you - maybe that would save the higher fine.
Hope you manage to sort it.
Jane