Hi guys.... yep - its a bit bright so I'm going to stick some plastic behind the lid..... can any one suggest where I can get some from and the best colour to use ?

Terran

I used a bit of a Leitz transparent blue A4 folder - similar ones are available from Esselte and other stationary suppliers. It is a nice deep blue colour and quite thick.

I use the same kind of thing as Night Watchman which I bought from Wilkinsons and I went for a charcoal grey colour as it keeps the light a neutral colour.

Have a look on Ebay for "Gel filter"
I used dark blue.

Frank