Cut it down by a third now,John..to stop wind rock,and make sure it is firm around the roots.... prune it down to an outward pointing bud,in the spring..removing all stems growing inwards,or criss crossing..to open it up,and reshape it...the same applies to most roses..

Thank you for replying via a PM,to which I replied..you can also reply via this comment box,as other members may wish to give you additional or extra information,on this, or any other questions you may have..welcome to GoY..:o)