If you've cut off all the tops there are no leaves left to photosynthesise energy from the sun. The best you can do in that case is give them some bonemeal for their roots and, once they've had a seriously good soaking from autumn rains, a good mulch of well-rotted manure and/or garden compost for both roses and clems. Next year, wait a bit longer to cut back the clems and let their foliage die back first.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Thanks @K67 . I'll remember that for next year. To be honest, most of the leaves were fried in the drought despite watering. There's plenty of new shoots on it so I'm sure it'll be ok.
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I normally cut them back now partly to give the climbing roses a bit of light.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw