Posted: 08/08/2013 at 17:26
strangely enough I was Googling this just yesterday - I found the following info:
Maintain the flowering performance of the beauty bush by pruning each year immediately after flowering. Cut back flowered stems to a sideshoot that hasn’t produced flowers or to a plump bud. Congested plants can have one-in-three stems removed, starting with the oldest. Old and neglected plants can be rejuvenated in the same way. Established plants tend to sucker and these may need to be removed.
This info was on the "July pruning" page of http://www.crocus.co.uk/features/_/articleid.977/ Now I haven't done ours yet even though it says July as it is still flowering so I will probably tackle it in the next week or two, as even if it's still flowering then I want it to have enough time to grow bewfore the winter.