The weight of the brass model is 15oz (425g) and the Silver/Green ones are 11oz (312g).
I reckon UK P&P will be £3 for per lamp by Royal Mail. For anyone wanting two lamps, I'm hoping that I might be able to package units into a single parcel weighing less than 1kg in total so that it falls within the same Royal Mail price band...but I will have to check the size and weight thing once they arrive. I think the best thing to do is to charge a flat £3 per lamp and then refund the difference if I can squeeze them into a single price band.
OK...everything sorted I think. I'll work the group buy thing out and post it on the group buy thread over the weekend...probably on Saturday night as I plan to spend a well deserved night in my shed tonight stroking my shiny kit.