Thanks for your reply, whitewave. I'm reluctant to buy a fungicide spray as they warn that bees are affected by them. I bought this rose from the grower at the Harrogate flower show and it is supposed to be highly disease resistant. I have treated the fence and the trellis behind it with a solution of Jeyes Fluid to get rid of any spores, but more in hope than expectation! There are two other roses (not climbers) on the same fence but they are not affected by the rust - one has blackspot and the other is fine, as they were last year.
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I have done a forum search on this topic but can't find anything, so, all you GN rose afficionados out there: is it worth persevering with a rose that has a rust problem? We have this problem again on an Aloha climbing rose. It started last year, and I ended up taking nearly every leaf off the damn thing in an effort to stop it spreading, and making sure that the ground underneath was clear. This year, it's back again, and this morning I took off half a bucket full of leaves. There is a hollyhock next to it which has rust this year, so that's been pruned out as well. I don't want to lose this "disease resistant" 
rose, and am unsure what to buy to treat it with - there's a lot of information and it's all a bit confusing to a bear of little horticultural brain like me!
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