But the BMA has so far refused to rescind its advice that GPs facing such demands are legally obliged to pay up.
Novachannel AG has written to a number of GPs offering them a 'free' listing in Physicians and Therapists Guide.
But the small print makes clear that, by replying, GPs have agreed to advertise in the publication, and will be billed for several hundred pounds.
Those who refuse to pay have been faced with a succession of letters threatening legal action, each demanding more money than the last.
Now the company's offices in Lucerne have been raided by the Swiss police. Nine people were arrested, and documents impounded. The Swiss authorities said the raids were motivated by complaints from victims spread right across Europe.
However, prior to the raid, Novachannel seems to have sold its directory business to a different company based in Portugal.
GPs who were tricked into signing up to the Physicians and Therapists Guide have continued to receive identically worded demands for payment.
A BMA spokesman said that 'there's quite obviously a lower risk to GPs that they'll be charged if the company has been told to cease trading'.
But he stopped short of rescinding the earlier advice to pay up, simply saying that the association would be 'monitoring' the situation.
One GP who was caught out complained that the GPC had been of little use.