The leaf and fruits look more like a Passion flower, not a clematis but no doubt I'll be proved wrong!

no you won't Cammomile, I entirely agree with you - this is not a clematis and C. 'sieboldii', like most clematis, only produces fluffy seedheads, not fruits of any description. It is definitely Passiflora, most likely P. caerulea. Fruits are edible when fully ripe (they'll be orange when they are) but fairly insipid.

Yes, a lovely Passiflora!

Hi, welcome to GoY, I agree with the others, Passiflora, but you're very lucky to have them setting fruit, I had 1 for about 8 years, and every summer always had between 80 and 120 flowers at any given time, but never once did any set fruit, they're only frost hardy, so any lower than about 23f and they die, I lost mine in 1 of the very cold winters we had a few years ago, Derek.

I meant to say...the confusion with Clematis florida sieboldii is understandable. Its usually the other way around. Almost everyone who saw my clematis thought it was a passion flower! :)

thanks everyone - looks like i have been lucky then this year - it is really pretty when the flowers are out - i have another climber that has left hundreds of berries about the size and colour of elderberries - would they also be edible?

You need to identify it first. There are many that are poisonous from the Solanum family (i.e. Deadly nightshade) so you have to know for sure.

If you could take a photo Ralph, we might know what it is from the berries and the habit of the plant. I can't think of an edible climbing plant berry off the top of my head, so chances are it could be solanum which is very poisonous as Cammomile says.

...well, unless it's a grape of course! :)