Great, thanks David. I spotted two in a charity shop yesterday (didn't buy them as I'm not a great Chance fan really) but was just curious as to whether they were Chance etc...
I was also wondering, was it Chance that made the commemorative glass plates for the Queen's Silver Jubillee in 1977? My mother bought me one at the time, which I still have, in blue and silver - I seem to recall they came in red and silver as well, and are about the size of a saucer.