Any use of weed killers nearby, Whirley? Especially Weed and Feeds?

No, not unless the neighbour has used it but we have a privet hedge between the gardens - have noticed two of my other roses have the same, in different parts of the garden. Some of the leaves are ok & look really healthy & flower buds are forming.

Nope, if your neighbors weed killer was a problem, the privet would have shown it first. That leaves powdery mildew, aphids, and thrips as likely candidates, but the first two are pretty obvious, and thrips usually affect flowers the worst, on roses. Another, rarer possibility is a virus called rose rosette, aka witch's broom. That is bad news, because it is almost always fatal, quite contagious, and entirely incurable--really hope that's not it! If that's it, remove all affected bushes, and wash all of your pruning tools with a 10% chlorine bleach solution, so they won't contaminate the healthy remainder.