British drug giant GlaxoSmithKline has finally admitted that thousands of babies in this country were inoculated with a batch of toxic whooping cough vaccines in the 1970s. Some experts believe that these Trivax vaccines - which had not passed critical company safety tests - may have caused permanent brain damage and even fatalities in young children. In 1992, the family of an Irish boy, Kenneth Best, who suffered brain damage from one of these toxic vaccines, was awarded 2.7 million in compensation by the Irish Supreme Court. The boy's family finally won this historic case after his mother Margaret made a startling find when sifting through tens of thousands of company documents. She discovered that the Trivax vaccine used on her son, from a batch numbered 3,741, had been released by the company despite it having failed to pass a critical safety test. Documents revealed that the 60,000 individual doses within this batch were known to be 14 times more potent than normal. Last year an investigation by The Observer found evidence to suggest that vaccines from this faulty batch ... had also been used in Britain. Liberal Democrat MP Norman Baker raised questions in the House of Commons, asking whether vaccines from this batch had been given to British babies. Then Health Minister Yvette Cooper wrote to the company asking for information. Now, almost a year later, GlaxoSmithKline has replied that it is 'highly probable' the toxic batches had been used in Britain.