I thought you all might be amused by Bulgin's lack of ability in geometry!

 

Looks like a copy of deutsch connectors.

 

Obviously the intention is to not be able to work with any other brand of connectors.

 

It does have that effect but there are other advantages. I've encountered deutsch connectors on Harley's and yes, they are specific to their mate (like most of them are). But they are also IP rated and very easy to work with. Never had one go bad.