Hi Ian,
I have not ever used unger gloves, but I thought they worked on the principle of a diver's suit, allowing a "jacket" of water in, but keeping your hands warm, but not dry. I'm probably wrong.
Sealskinz are totally waterproof. you can get them from Outdoor Gear shops (or by mail order)
http://www.outdoorgear.co.uk for some reason they dont appear in the online catalogue, but you do get them there.
Other outdoor shops sell them too, there's a list of stockists on the sealskinz website :
http://www.sealskinz.comYou'll need to stock up on Neutrogena too, as your hands soon get bad.
I thought "Ha, no problem with bad hands now that its pure water, because theres no detergent!" But pure water is much worse to your hands, as its slightly acidic. (I read that, as its so pure it dissolves carbon dioxide from the air to form carbonic acid. This of course doesnt cause spotting, but it has an effect on your hands)
However, using a pole your hands dont get freezing the way they do with ladders, you dont realise how bad that is until you stop using them.
-Philip