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For example owners of successful companies employing hundreds or thousands of people. Like office/hotel cleaning companies where the owners need to visit clients and potential clients negotiating business contracts and don't want to either pay all the fines that result from not being able to leave a meeting just because their parking is running out or spend time trying to find parking in some of the most congested spots in town.
Serious question. Other than diplomats, who are these people being chauffeured around London in blacked out S classes? Despite the cost of living crisis I seem to see half a dozen on my 10 minute walk from train station to the office.