Some climbers, including miniatures, only bloom on year-old wood, so this may be one of them. Blooms next year, as long as it isn't pruned too hard before spring.

Thanks Tugbrethil, I can relax now. Must remember to tie it up well before autumn, we have very strong winds here.

I was taught to bend climbing roses as they grew to slow the sap and encourage flowering.

Drc: That's true, most climbers bloom better if they are trained into arching patterns, but Seabird still should have gotten some blooms if it was a kind that bloomed on new wood.

I didn't know to bend them but they seem to be doing that by themselves. Most of the new stems are at a 45 degree angle and I've now secured them to the fence. I'll train them into arches, that will be easier where they are and look better too.
Many thanks Tug + Drc.