I think some of them were amateurs as they have no other credits.
British characters were depicted as bad/funny/good in HK films depending on the film.
Also senior police officers and judges in HK films were often British.
Some more I remember right now...
Yes Madam! (I think Cynthia Rothrock plays a British police officer here?)
Mad Mad Ghost (the 2 baddie treasure hunters are both British)
Untold Story 2 (senior police inspector is British I seem to remember?)
Fist of Legend (British Judge and another British character I seem to remember)
Run and Kill (British bartender)
Frankly I hardly pay attention to these British characters in Hk films anymore as they often pop up.
Unless they are played for fun of course.