DJPil should be able to offer a comment, I'm sure.
As some-one said, I was waiting to see what particular aircraft types raised the issue. Even CAR 3 had the white arc down to Vso. Perhaps JT has a copy of BCAR Sect K or ANO 101.22?
The
ASI in this Airtourer seems to have the bottom of the green at the top of the white?
I get confused by the those American aeroplanes with the ASI marked with
speeds in CAS per the early FAR 23.