Posted: 26/04/2015 at 20:48
TC the reason that's not flowering properly and well is it isn't trained properly. You've allowed the stems to grow vertically which leads to flowers at the top and nothing below it. Climbers need to be trained laterally or at 45 degrees. You need to take about three of the longer stems and tie them in to the frame, and do it asap. Prune out the weaker growth and keep the laterally trained stems as horizontal as you can. New growth will appear from the lateral stems which will produce flowers. Once you have the frame work don't let growth come out away from the frame, keep it cut back to nothing more than 6 inches. Once you've pruned and trained it, feed it with a rose fertilizer and mulch and water it.
Oh and catch up with the last edition of GW, on BBC2, Monty Don demonstrated this exact technique perfectly, so it will make it perfectly clear.