Most shrub roses don't need to be pruned. Just take out the dead wood and lighten up the center for air flow.

Rob, I would expect you will have all sorts of answers.
I personally prefer to remove these canes completely, but I am sure there are many other people who don't do this. Everybody will be advising something different. Roses can tolerate it all, grow and bloom well, that is good part. It all depends on what you want to achieve with your bush.
Olga

I agree with Olga. I would remove the cane. My Graham Thomas was a huge shrub that would reach heights of 9 feet. I routinely cut him back to 4-5 feet after every flush of blooms. I got many more blooms that way and they weren't waving around 9 feet in the air. That is assuming that you want him to be a shrub and not a climber.

Carol

Hy hedge of Graham Thomases (about twenty plants all with RMV) were very tender to winter damage and also tended to break dormancy early in spring, only to loose the new growth to freeze which became the sites of additional cankers. GT has my personal best record for thirteen individual cankers on one cane.

I tried to keep as much cane on those plants as possible. Often in spring, I'd leave three or four unpruned but for active damage because of new birds nests or because Praying Mantids were about to hatch. The whole row reached the same height by fall. Forcing multiple laterals to break never worked with those GTs, but those were not the healthiest clones out there. (They were from ParkWayside about twelve years ago. All are gone now.)

On some similar Austins, I've done no pruning back to eyes on the laterals and they've bloomed well in spite of my indecision as to where to cut. Leander and James Galway can best decide where they want to bloom (and both might be said to self peg as their upper canes bend gracefully downward when allowed to be self supporting). I think it's a function of the plant, and I think we should learn how each behaves without our intervention, before we go in and try to make it do something it might not choose to.

Thanks for the advice! My GT will probably be fine whatever I do, it grows into a nice shrub and doesn't get too big. I use it as a seed parent so let all the hips mature. That takes a lot of energy that the plant cannot spend on other growth and flowers. Well, I just wondered what to do with canes that have laterals of laterals of laterals of laterals, so to speak. Some canes I removed, some I pruned down a bit and on some I left the bigger laterals there. A bit of everything, LOL.

Jayne Austin, on the other hand, I pruned way back like a HT. There were no new canes last year, only growth on the top of old canes that lost vigour. If they don't shape up this year, out they go. It's a shame, it is one of my favourite flowers and one of the best scented roses in my garden (scent quality). Oh well, let's see if there is a worthy successor that is a better plant :-)

Rob