Hi Paul, and a warm welcome to the forum. grin
It's great to have another Scott Bonnar owner on board.

Your mower is a Scott Bonnar 'Centenary' model, first introduced in 1936,
and came in 16"and 18" cutting widths. Not much is known about this mower but the original Centenary was a 16" and had a cooling shroud on the right hand side over the cooling fins of the Villiers, and some sort of vertical plate, hinged in front of the motor, maybe to cover the opening of the grass-box whilst mowing, to stop the clippings flying everywhere.

Here's an advert for the Centenary;
[Linked Image]
Paul, could you please take some more pics from all angles and post them here, it would be great for the forum archives.
Also can you please post what's written on the brass mower ID plate, fastened to the machine, just above the engagement end of the crank handle.
Once again Paul, :welcome:
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin