It depends on the variety, the rootstock (if they are grafted) and your soil. Grafted J&P roses didn't do very well for me, my soil doesn't like roses grafted on Dr. Huey. On the other hand, the J&P New generation roses that are own root but their size and roots were enormous did extremely well. Most of these New generation roses were David Austins and they reached their listed full height or close to it in the first year. Black Magic from J&P grafted on fortuniana should be huge and bushy and it is a skinny and weak plant (in its second year) compared to Crown Princess Margareta or Christopher Marlowe, both own roots. Jubilee celebration, a supposedly (and hopefully) small, low growing Austin also performed very well in its first year. I doubt that I will ever purchase grafted J&P roses again but I am and will be tempted by their own root roses. Of you list I have only DD from J&P, must be 8 or 9 years plant, the only 'milk carton' I ever purchased. It did well in its first year, it was the first to bloom; it was a grafted plant but 2 years later we dug up and replanted with the bud union deeper so it went own root. It did better own root in my yard though after 8 years its performance has become disappointing. But, YMMV since you garden a different zone and maybe your soil will also have a lot to do with the performance of the J&P roses.

Spain has a Mediterranean climate like California and Southern Oregon where I live. You will be able to grow fabulous roses as long as you have enough water. You may need to give the deep reds some afternoon shade. Tea-noisettes, teas, and chinas will be great there and most of the other classes except perhaps some of the gallicas and albas.

It's probably the rootstock. I would mark those canes and see if they bloom again this summer, if not it's almost positively the rootstock. Dr. Huey is a once bloomer that only blooms on old wood. If it reblooms you know it's not Dr Huey rootstock. If it's rootstock most likely the grafted rose will die out and Huey will take over. Someone more knowledgable will have to advise if there is any chance of saving the grafted plant by cutting those newer canes off all the way down below the ground - my only experiences with Dr Huey were cases where the grafted plant had completely died off during bad winters and I ended up removing the entire plant.

aah ok... lucky you!.. sounds great... in that case I would just plant it and let it do its own thing until the time comes when you feel it needs some control or training, if at all... I think in the first year or two, you might have to use a piece of bamboo cane or a pole of some sort, inserted into the ground near the rose, to tie the canes to, and aim them at your oak tree until the rose finds its own foothold... I've had to do that before with a big rambler up a willow tree.. in such cases, forget about pruning to be honest... it'll soon be out of reach...