Centradenia! Thank you SS and Isabella. I'd never heard of it! but now I have and I know I've got one!
By a strange coincidence, I got an unlabelled trailing plant a few weeks ago for 50p. It was quite straggly with very few flowers left, but with a bit of TLC it has recovered quickly, now got lots of buds on and is making new shoots. Also a stem that broke off I cut into sections and they look as if they are rooting.
So I just Googled Centradenia, and it's definitely it. How tender is it really? Sometimes info on that is a bit iffy.
That's what I was going to say! But I am about to hit the hay, so hope I can still have a guess in the morning. Maybe another wee look tonight ;D Has to be related to a campanula, surely, so I am going to guess Cyananthus. Have only ever seen a photo though. Whatever it is, your camera is a cracker Susie. Being able to get such clear detail. Glad you are having fun, and giving us some too I await your answer.
They are related to Campanula as Weeterrier said. There is a gorgeous pale pink one too. For those who have not tried them, they are very easy, but they are late risers and early bedders. They do not appear until well into spring and disappear well before autumn. Not as close up as Susie's but close enough to get the colour I think.
I would have imagined that flower to have tissue like petals, but the camera shows them to have a different texture all together. I've never come across it for sale up here, but I'm assuming it could be grown from seed? Like I need more flowers