If you come back to see this.
Being honest if I had half a brain I would have thought of that so will be trying it out later hopefully the fixing holes for securing screws line up then thanks my problem solved.
Of course as 'er in doors' likes the look of the cover plate on the new dimmer.....brushed steel effect it may be a battle to change it. The old cover plate is off white so might have fight on me hands. What's a divorce cost nowadays?.
More brain concentraction was ensuring the dimmer wasn't operating the 10 low voltage lights over and above it's 400w capacity.
Bob
November 2010