He wasn't wrong though in imagining I'd try, which I did, but unfortunately my effort was less than inspiring, as can be seen above.
Despite using a tripod, time exposure, fiddling with ISO settings and a 300mm zoom lens, even with photo editing software no details could be seen. The problem is clearly over-exposure and if I'd had a bit more time would have had another go but the phone rang and then the moon went out of sight.
There are very good instructions here as to how to do it, so next time will hopefully be more successful.