Well thanks for all the info, that's great about the ME article my club has a full set of ME so I will go and dig those out.
Noel that would be great, I guess all I really need is the LWH of the bottom box I guess the diameter of the lens and maybe the height to the top of the can on top. Then I can pretty much guesstimate the rest.
Jon I am in the midlands so a long way form you, thanks for the offer though. Is there any chance of getting a few basic measurements of your lamp? With just a few dimensions I can make the rest fit. At the moment I'm not sure if they are 6 inches across or a foot so a few basic dimensions will get me going.
Thanks Again
Buffer.