You might have pruned the flowering shoots of!! dont prune anything this year or next spring see if it flowers next year and then leave the flowers on untill you see new growth the spring after that ! then you can prune the dead flowers!! I THINK!!

Maggy's sort of right - if you pruned the shrub last year at the wrong time (i.e., not in Spring) then you may well have cut off this years flowering stems. Pruning should be done in about April, as the bush starts to show signs of growth - then you trim off any dead stems, last year's flowerheads (if there are any) and any dead wood. Other causes of non flowering are being planted in the lee of, or too close to, large trees and shrubs, causing dryness at the roots.

Thanks for your replies. I only came into possession of this shrub last autumn and have not pruned it at all, it was just a fairly small plant and so I presumed that it had not flowered in 2009. It disappeared during the winter and I thought it had died and then new shoots appeared in the Spring. I shall keep it watered and wait until next year....with fingers crossed.