Hardy Tropicals UK

Hello
Im looking for any information on hardiness,for any of the many var found in garden centres,in particular i like the red and purple forms of passiflora.
what experiences have you had in different locations?

Obviously it depends on the species.
I have found Passiflora caerulea to be very hardy having come through last winted unscathed.

This site may be a useful source of info for you
http://www.passionflow.co.uk/

Never had any trouble with Passiflora caerulea it even self seeds but as for the others I've never had any luck at all