Well, The old girl was 'worked on' by my father in 1980 and has stayed that way since then. I last used her in about 1998. The air intake is the diaphramatic 'snorkeled' version that was decalled with Patent Pending etc or Patent No etc. I have 2 mowers with different labels.I have 2 other versions with 2 standard air filters evidenced on earlier models as per advertising in 1957/58.
As far as the Cub, Scout and Patrol were concerned - (1956 and 1957), Patrol was always in existence. The Argus and The Age have ads supporting this. For example, in 1957 Boundy promoted tanother Lawn Patrol Golf Tournament - Kel Nagle won !!!(The Age 1957). I have other info to suggest that the golf tournament was held in 1956 as well. The cheaper Cub and Scout were both initially manufactured with the 1.75 BHP motor (Points under fly wheel). The Scout was up-graded but short lived - it became so close to the 'standard' Patrol that Boundy et.al., dropped it. Both were designed to meet the under 40 quid and under 50 quid markets respectively.

Lots more info at some stage but too may gaps in the info at present, so I am on the hunt particularly for Boundy's story. I would like to see a version of the LP 21 inch cut.
Time for dinner.
Regards,
Steve

Boundy also had a 2.5 BHP motor which powered the Myer Pathfinder and the George store brands.
Lots more