I'm in England's South Coast, with a climbing honeysuckle (can't recall exact kind) planted in the back, north-facing garden, against a waist-height east-facing fence. It gets full sun most of the day, and has white stones around the base to provide some root shade and retain moisture. Watered most days at the moment due to extended dry weather, fed weekly with Phostrogen.
However they soon turn purple and eventually yellow, then wilt and die, such as in these examples: Many also display tiny orange blotches, but I think that's from the neighbour painting his side of the fence.
The leaves show no signs of pests on either side (the occasional ant, but no aphids) an no residues on the leaves that I can wipe or scratch away.
I've searched extensively online. All I can find regarding honeysuckle and purple leaves is due to powdery mildew. However from photos online, it doesn't look like that to me.
I hope the images help. I really don't want to lose the honeysuckle if I can avoid it, so any suggestions are welcome.