Oh I didn't realise you'd be willing to swing that far out of your way, thanks anyway.
-Glass is 6mm (I have just found some 3mm which i'm hoping will be easier!)
-Glass I'd estimate is pretty old not sure exactly
-It's quite hard to get an even cut across the whole thing, especially when starting off, i.e can't get right to the edge, but everything I read says only make one cut