while getting an MOT inspection in London UK, the minimum requirement was 3 clicks and a max of 10 clicks and the car should hold itself steady on an incline.

But in this case his car is not holding. Its either the shoes on his car or the cables are jammed. Both my cars were this way (foot parking brake though) - but after cleaning out the brake assembly followed by buffing and lubricating it and finally adjusting it solved all issues - I can park on a hill and press the brake and it wont roll an inch.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)