Well done Trevor....yes it is Clematis Multi blue and what attracted me to it, apart from the lovely deep purple/blue of the petals was the fact that the central boss of sepals(?) - sorry, not very clear about botanical definitions in such cases - remains on the plant for quite a long time after the outer petals have fallen. These are a paler blue/grey/silvery colour as time goes on and, to my mind attractive in their own right extending the period of interest. It did not disappoint this, its first year,and after one early flower produced a second flush of 5/6 blooms.