Hi Max and Jack
Plenty of food for thought there, what a shame there doesn't appear to be any form of date coding. Thanks for the heads up on those mowers, they are about in the middle of both of us but will investigate further. Do you know if the Sunbeams only had the one large rear wheel diameter size or different sizes ? It looks like the wheels on the mower in Jack's images would be the same as my Lawnkeeper 2 but a bit hard to tell in the gumtree picture if they are the same.

Cheers
wce