Image Examples of fake coronavirus treatments in an image provided by the City of London police. Credit... The City of London Police

Dr. Ali, who runs the Private Harley Street Clinic in London, said he was unrepentant about his trading, after taking orders for nearly 7,000 tests at £375 each. He said he had donated 100 tests to the N.H.S.

“I’m entirely comfortable with the price, and if somebody else wants to offer it for less, that’s fine,” he said in an interview. “I believe the people should be tested, so I’m going to offer it.”

What Dr. Ali is offering for that £375 takes some explanation.

The Private Harley Street Clinic does not manufacture the coronavirus test kits, nor does it distribute them or process any test results. Yet it has sold the testing kits for more than three times the £120 that the manufacturer, Randox Laboratories in Northern Ireland, charges the public directly.

Once ordered on the Private Harley Street Clinic website, the tests are shipped from Randox directly to customers without ever passing through the clinic. Dr. Ali declined to say what he paid for the kits and claimed not to know what profit he had made, but he said that his price included clinical advice.

Private Harley Street Clinic’s main asset appears to be the marketing value its name brings through an association with the renowned medical street in London — despite company records showing that the “clinic” is actually based at Dr. Ali’s apartment, miles away in North London.

The firm was incorporated in 2017 shortly after Dr. Ali’s two previous companies, which had almost identical names, were struck off the government’s register of companies for failing to provide required financial data. Private Harley Street Clinic was also threatened with being struck off until it posted financial accounts last summer, which showed that it had total net assets of less than £200.