Well, normal pruning for Jackmanii is to cut hard back in spring so I wouldn't worry. If it makes new growth this autumn it'll be tender and suffer from the frosts, but cut it back again in the spring and give it a feed and I'm sure it'll flower its socks off again for you.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Well, normal pruning for Jackmanii is to cut hard back in spring so I wouldn't worry. If it makes new growth this autumn it'll be tender and suffer from the frosts, but cut it back again in the spring and give it a feed and I'm sure it'll flower its socks off again for you.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I find clematis pretty resilient. I'd not worry about it.