Its only "running transport passenger services without accreditation" if the cars are PAID for...
The same law applies if you drive into the city at night, crusing the streets and asking someone random if they want a lift home for cash... (basically an off the books taxi service)...
Otherwise its no different than you or I putting ribbons on a car and driving down the street... Its not illegal...
If the cars were 'hired' then there is something to answer to...
Otherwise... cash under the table or a slab of beer... no laws are broken...
*(I say this with experience as a wedding chauffeur for the last 5 years... and I have been pulled over and discussed this with the Police & Taxi Authority)*
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