Ineffective sound proofing from my new double glazed windows

[ianphirst]

I have had some new upvc double glaze windows fitted and they are less effective at keeping out the noise than my old single pane wooden windows. On the design on the outside frame there is a gap for drainage where the frame meets the sill. Is there any way I can insulate or reinforce the frame?

[welsh brickie]

By your discribtion it sounds like poor fitting Have fensa come out and check for you.
See if your fitters will come back and check first