TOO MUCH PASSION!

Having finally cut down and removed the tomato plants I have been left with the Passion Flower vines from 2 original stems (that wound around the toms).
Apparently cutting back 1/3 late winter is advised. When is that exactly and should I retain all the old leaves?

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so I take it as being late-Jan to mid-Feb
Wisdom is not putting it in a fruit salad.
If you plump for February, you should be ok.
However, more importantly, that's a helluva greenhouse you have! Fab
The more leaves, the more energy your plant will have when it starts growing again in spring.
I think the idea behind - prune in late winter - is to ensure that the plant is at its most dormant. Acers are another example of best being pruned in late winter.
Wisdom is not putting it in a fruit salad.
I’d leave it alone until pruning.
It's a beast of a thing once it gets going. I've spent 7 years trying to kill one and it still appears every spring.