Commissario
IIRC with black cabs they have to display the licence in about 3 places on the vehicle and the driver has to display a physical ID badge with his name/photo/number etc on it (which I think is meant to match the vehicle's displayed one), and at a guess will have the same sort of physical security/anti tamper features as the driving licence (a blue badge these days has a bunch of anti tamper/certification features so I can't imagine a black cab ID being less secure).That is absolutely disgraceful - you should have reported him / her.
As a matter of interest, how does one know who is actually driving a black cab? Do you get texted a photograph in advance?
One has to wonder - why don't you just hail a black cab instead; why do you bother with Uber
TFL also have a page on their site to verify licensed london cab and private hire drivers.
Oddly enough I'm slightly more reassured by a physical ID issued by a trusted authority who have to do checks, than something shown on a phone app that is run by a company that has typically seen the idea of devoting resources to statutory duties as onerous and only worth paying lip service to., preferring to spend money after the fact to try and argue that they didn't need to do those checks properly.
IIRC the police in London working with TFL do fairly regular random checks of black cabs, especially if there have been any complaints about fake ones.
I actually like the idea of Uber and similar apps, the problem I've had with Uber from the word go is that their attitude to public safety and privacy has been at best, awful.
They've repeatedly shown a preference for going after people that point out their failings than addressing their failings, treating the data of users (especially high profile ones in the early days) as entertainment, and treating the law as a nothing because they are "disruptive technology" until the legal authorities start to actively go after them in full force to make them stick to the same requirements as everyone else (and if they want things changed, to do so through the proper route rather than trying to use loopholes).