Hi everyone and thanks for all your help. I've been off radar all day and have only just got back - so sorry for the late post. First of all excuse the spots all over the photos - its the fat balls - messy birdies.!
Right , this is the chain of events.
About 10 years ago I ordered a snowball bush from one of the plant sites - can't remember which one but something like Suttons or Jersey Plants . The above mentioned whatever arrived complete with a label to say it had been grafted . Not understanding much about that process I had a good google and tried to make sense of it . I duly planted the snowball bush and had 2 things growing together. Being a bit daft back then I decided to cut off the sucker which I believed to be the shrub it was grafted on to and next thing I had this tree growing in its place but years later the original sucker came back - only tiny but I did recognise it as a viburnum so I tried to root it . It died . Only discovered this shoot a few days ago and as stated it's quite strong and healthy so I'm going to try again. It's the biggest mystery ever and I am determined to find out what is going on ! the sucker which I believe to be the original snowball bush is without a shadow of a doubt growing from that blessed tree ! Am now on a mission.