Wow thank you for your responses.
The pruning was mainly to keep the plant in check in the winnering months when heavy snow could damage foliage. Also to get the most out of the plant and keep it in good health so it delivers the best possible show for me.
My main shrubs are Vibernan (gorgeous scent) and buddelias - i cant get enough of them. The other bushes in my garden get the chop when i decide they are taking over more than they should.
I have a cherry blossom of which dosnt fruit that puts on a wonderful blossom dispaly for me. I pruned this in spring - cutting into a goblet like shape so air circulates and keeps disease at bay. It will need a trim before winter and its got very high. I was thinking maybe an autumn haircut for it.
I like the saying "growth follows the knife"