I rather think, although I'm not a clematis expert, that bicolor is a description rather than a variety, for example my Nelly Moser is classed as a bicolor because of its two shades of pink. Whatever type you have there, my guess is that given enough sunshine (this year? lol) they will open up and when they do you could post another picture and somebody knowledgeable about them will identify the variety for you. As they have only been in a few months they may be slow developing so even if they are not really good this year don't worry, just wait a year or two.

Probaly the cold and wet hasnt helped, are these in the shade ??probably need sunshine like we all do

Gg

I just googled this plant - what a lovely thing it is when in flower. As you say, Marion, the cool conditions may well be the cause - if other flowers open later (if the weather warms up) and they're normal, then its a passing thing. Hard to say if they'll have the purple centres - the greening may affect the whole flower.

Wait for a few more days - I think the flowers haven't fully opened yet. Yours are ahead of mine - my flowers are still in bud

Thank you everyone, I am just too impatient I think.....