climbers in zone 8

I'm wanting to add some permaculture techniques to an existing small garden in the UK. Could anyone recommend some productive climbers to utilise the vertical space? Things like honeysuckle go well here but obviously something edible would be better.

I am an advocate of Luffa.  When small and young I hear they are yummy... too late to try when I had bushels of the things.  They are super handy to use around the house and are lovely in bloom.

air potato Dioscorea bulbifera
other yams Dioscorea spp.
mashua Tropaeolum tuberosum
passionfruits Passiflora spp.
kiwis Actinidia spp.
lablab Dolichos lablab
malabar spinach Basella alba
akebia Akebia quinata and A. trifolia
ground nut Apios americana

those are a few that come to mind quickly.  they're all pretty easy.  most, should be perennial in zone 8 if you treat them well.  the exceptions would be some of the passifloras, malabar spinach, and lablab.

Thanks for your help guys. Do you think luffa would grow in Zone 8 - from what I know about it, it likes fairly warm temperatures ?

I was in zone 8 when I grew a truckload of them.    One plant about covered the front (south) and west side of my home, planted in the corner.

Nice one. Thanks - I shall order some!

email me for seeds.  I have plenty again.  I will be able to say how well they grow in zone 6 next year.