R228,
In my company we can 'self position' The company assumes that you live close to your home base so your duty will start at the time that your taxi or hire car would leave your home base to go to your place of duty i.e. another base. If you live closer to this 'other place of duty' it would obviously madness to make you go to your home base first so the company allows you to get to this temp base under your own steam.
This seems entirely logical and reasonable but then there are no unions involved.
Regards