Tom,template tom said:
That's really kind of you, I have uploaded a pdf of the fitting instructions and a link to the site I brought them from where you can see them in situe (http://www.tlc-direct.co.uk/Main_Index/Lighting_External_Index/DriveOver_Light/index.html). My decking is about 30mm thick and about 143mm wide. The groves are about 2-3mm deep. and about 10-15 wide, hope that makes sense?
Should I buy or make a template guide for the router? Or will your plan guide me though making a template? Sorry if that seemed a dumb question!