Dear jackb, I'm sure you have your reasons to be so pessimistic and hopeless, but I strongly disagree with your speech.
Winning the case is not easy, but if you match the conditions, have the adequate proof and your solicitor leads you well, the most sure is that you win it.
Well, imagine you've won against the bak in First Instance.
Before going to High Court, there's an Appeal in the same province as the First Instance Court. The Appeal Courts of Alicante have no doubt on confirming the judgments that obbly the banks to pay back.
However, if the bank appeals to the Province Appeal Court, this won't imply you to afford any payment, as you can deal with your solicitor that any fees for the Appeal should be paid after it is finished. The banks will have to pay the "Judiciary Tax" for the appeal.
And, on top of that, you can execute the First Instance judgment, and get your money and your interests, with the compromise of returning them if the bank wins the appeal.
OK. Imagine the appeal confirms the First Instance judgment. You kee your money, your solicitor will be more than happy, because the bank will pay for the appeal fees...
Can the banks appeal to the Supreme Court? Well, that's not that easy, my friend. The Supreme Court is not a "third instance". It's just an extraordinary instance to which only a few cases have access. The conditions to enter an Appeal for the High Court are: 1) Procedural error 2) Legal infraction or 3) Litigious amount over 600.000 €. In fact, the High Court usually requires 1) or 2) + 3)
So, the possibility of appeals to the High Court is very unlikely.
And, if you won in first instance, YOU WILL HAVE YOUR MONEY ALL THE TIME as you can, as said before, execute that ruling.
Please, try to be more optimistic