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Airport clients most often mention the meet and greet and the waiting time, because those are the parts a delayed landing tests. Corporate accounts tend to comment on the same chauffeur returning and on billing that arrives once a month instead of as a pile of receipts. Wedding and event clients write about the waiting, since a car held through a ceremony is the point of the booking.
Every chauffeur named in these reviews holds a Transport for London private hire licence and has cleared an enhanced DBS check. That is the floor, not the achievement. What clients describe above it is punctuality on a bad traffic day and a price that did not move, which are the two things a fixed-fare booking is meant to guarantee.