It doesn't look like any clematis I know. I think it may be Leycestria, also called Pheasant Berry. If I'm right, then you'll see the birds eating the berries.

Hi Kate it is Leycestria formentosa. as already said. Another common name is Himalayan Honeysuckle. Not a climber though the birds love the berries.

Thanks Verlie, Julia and Eileen. Much appreciated. I did think it was a bit odd when he said it was a clematis..saying that I’m not an expert.
Just wondering, is it a good plant to put in the garden then?

I guess it depends on whether you like your garden ultra neat or whether you enjoy pretty plants popping up in unexpected places of their own accord! I have several of this type, such as linaria, valerian and verbena bonariensis, although I've never had a pheasant berry. If it is good for the struggling birds it sounds good to me, as long as you can pull them up easily if they grow where you really don't want them.

Thanks Pennyfarthing and Julia, good advice. I’m thinking of putting it up on the Bund hill for the wildlife. OH mentioned the garden bin! 🙄

It associates well with fuchsias

It would go well on the bund and can take hard pruning to keep it in its space/place.

Thanks Andrew, good to know! Thanks Eileen, I planted it on the bund yesterday afternoon . 🤞