A mother who claims a disgraced paediatrician accused her of poisoning her "severely ill" son called yesterday for a full public inquiry into his research work.

Janet Alexander, of Ludlow, Shropshire, said she has fought for 20 years to see Dr David Southall brought to justice after he accused her of trying to harm her son, Lawrence, now 21.

Dr Southall treated Lawrence at London's Royal Brompton Hospital in 1987, after he began to suffer from breathing difficulties when he was six weeks old.

But he blamed Mrs Alexander and her husband Robin for their son's difficulties and started care proceedings against them, she said.

Lawrence Alexander's case was one of five considered by the GMC before Dr Southall was struck off the medical register on Tuesday.

Mrs Alexander said: "It was frightening and we could not argue with the man. He was absolutely certain he was correct. We're hoping now there will be a full public inquiry into all his research work on all these babies and that justice will finally be done."

Dr Southall, who was struck off the medical register for serious professional misconduct, may appeal against the decision, his solicitor said.

The GMC's Fitness to Practise Panel delivered its ruling on Tuesday after finding Dr Southall, 59, guilty of falsely accusing a mother of drugging and murdering her 10-year-old son. Chairman Dr Jacqueline Mitton told Dr Southall he had "deep-seated attitudinal problems".

Dr Southall worked as a consultant paediatrician at London's Royal Brompton Hospital from 1982 and held the same post at North Staffordshire Hospital in Stoke-on-Trent in 1992.