Harry Efthymiadou, 49, was likened to Del Boy from Only Fools And Horses after police found more than 100 people partying at his Cut And Grind barbershop.
His makeshift bar, compared to a prohibition era speakeasy, was hidden behind a “secret door” at the barbers, Westminster magistrates heard.
One officer said he was “visibly shaken” after discovering so many people crammed into the basement room.
Pc Vimbai Pasipanodya said: “I thought of my cousin who worked in the NHS and died trying to help the ill people, and it seems she had died in vain when some people are very inconsiderate by hosting such an event.”
Efthymiadou was caught on December 11 last year after a neighbour complained of excessive noise from the barbers in D’Arblay Street, Soho, while Londoners were living under Tier 2 restrictions.
He tried to claim to police that just 15 people were inside the shop, but officers spotted the hidden entrance to the basement “concealed within the wall as a ‘secret door’”.
The basement had DJ decks and “Slush Puppie-type machines being used to supply drink”.
Another officer said Efthymiadou, holding a cigar, claimed the party had started with just a few friends, and suggested the bust was a “waste of police time”.
He added: “He wore a cap and smoked a cigar like the TV character Del Trotter and spoke in a similar manner.”
Efthymiadou did not enter a plea but was found guilty of holding a gathering in breach of Covid regulations. The barber was ordered to pay a £10,000 fine plus £300 in costs and fees.