In reply to Norfolk:
In a village called Benaoján there is an excellent beginners via ferrata, I believe it's for children (edit: it is: see 'Via Ferrata Benaoján Infantil' on google maps) but I've used it to check competency and appetite for exposure (the biggest ladder is only 8m or so). Then across the road there is a more challenging via ferrata.
Most of the via ferrata in that area have little boards describing the routes, difficulty and access.
I believe you are allowed to use the routes without a guide.
Feel free to message me directly if you need more info. I'll also be there over Christmas so you may see me there