Sounds like you've got the ideal car but have you got a bead-mat over the driver's seat? Without one of those, you're nobody.:blink1:
I guess if you're in earnest,then it would be worth going through all those hoops if only to qualify for the Congestion Charge exemption sticker.
I can't help feeling that a lot of our local minicab drivers haven't gone to these efforts, although they were trying to raise the bare minimum standards a while back. If I recall, it involved simple things like displaying a relevant insurance cover note to prove entitlement to carry paying passengers, some photgraphic ID for the driver (oh yes, and an AtoZ!)
Not sure I'd want to do local stuff, like taking people to and from a pub, laudible though that is in keeping drunks away from steering wheels, if only for the fact that you could spend the next day getting the car hosed out and a month getting rid of the smell!