On Tuesday, 6 March 2018 21:55:35 UTC, Recliner wrote:

Here's Newcastle ("up north" straw poll):

Base Fare £0.60
+Per Minute £0.10
+Per Mile £1.40 -interesting this is higher

A £5 fare would be (at 20mph) 2.6 miles, £20 11.5 miles. That's a
stupendous amount of "getting lost"

Yes, the claimed £5/£20 numbers don't really make sense, do they?

I thought it must have been "stuck in traffic" time - but at 10p a minute that would be a big, long traffic jam. It must be a combination.

Let's say the cab was stuck in traffic for 3 hours, and the punter asked the driver to take an alternative route which was an extra mile:
60p + £1.40 + £18 = £20.
That's a bit unlikely, but a bit of tweaking might produce something more realistic.