It seems that what was said by Gary Aitkenhead of the Porton Down establishment wasn't properly understood or quoted? Boris should remember this quotation for the future?:-

“ I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant”

That could be re-phrased to :- "I know what I said but what you think I said is not what I meant"?