No GM screen listed on Leisure Games website - I was in there on saturday, replacing my lost SoHK and they seemed to have a lot of RM stuff. So maybe that means it isn't available in UK.
I reckon it's time to go old-school, get your books down to the nearest photocopier, scissors, glue, breakfast cereal box and - hey presto - a permanently icky reference guide where the most important tables fall off at the mere clatter of a pair of d10s, but that has the added bonus of being able to adhere irritating player's mouths shut with the merest flick of the wobbly screen.