Recently puchased a 1952 Atco 14'' and an Auto Certes Mk 3 V (20'' ) via ebay.
After draining a bit of gunge out of the Atco I fitted a new plug before putting a 16:1 mixture (traditional oil) into the fuel tank. Tickled the carb and with the choke set she started third kick of the pedal. Idled well too.
The Auto Certes also starts and runs well. She was also bought via ebay from a garden maintenance firm so has had a lot of use. Hopefully though has been reasonably maintained. I'm not great with engines so will just change the oil, spark plug and generally tidy her up. Incidentally if there's normally a wooden roller at the front, this has been replaced by one of solid metal.
Will upload a photo of them later this week.