Earlier quoted context omitted.
How much does that really cost though? Is that from central London?
You're looking at roughly twice the cost, usually more if it's late on a Friday/Saturday night. I used to regularly travel from Zone 1 to just inside the M25 to the West of London ─ an Uber costs ~£40, whereas I've paid between £80 and £120 for other private hires for similar journeys.
I can actually walk that in under an hour if I need to.