Clematis "Firework"

That's gorgeous !

Thank you the flowers are as big as my hand

Lovely ! Clematis are one of my favourite plants, Bowbrick.

Do clematis need pruning? and if so when?

Certain ones do and others don't.
I think Spritzhenry wrote a blog on it a while ago, have a look at her homepage because i think it directs you to the blogs she's written ..... i'm being very lazy here because i could have written it all out for you.