this is the advice I use from the RHS
https://www.rhs.org.uk/Advice/profile?pid=189

I tie the young stems in as close to horizontal as I can as that helps them produce more flowers.

Thank you Sbg, yes that's what it needs more young stems for that very reason. I wasn't sure if January was the time you would prune climbers..

Janey, first remove anything dead, diseased & crossing branches. Then choose 3 or 4 of the strongest leaders, and remove the rest. Don't cut the chosen leaders at all. If you peg them in a horizontal position, they bloom all along the entire leader. If left vertical, they will only bloom at the tips.

Time to prune: February, March, April, September, October, November. Avoid the hottest & coldest times of the year.

Thanks very much Paul for that. This climber has only very old wood at the base with no new leaders, all new growth has been at the top of the old hard wood. If I don't prune it right back, the new growth this year will be the same. If I prune it right down, will I kill it? Roses aren't my forte...:))