A decorated military surgeon has apologised after conducting unsanctioned surgery on a 12-year-old’s genitals.Surgeon Commander Anthony Lambert has been branded “not trustworthy” by the boy’s “furious” parents, who have accused him of destroying their son’s trust in doctors.The incident took place during a routine hernia operation, conducted under general anaesthetic, at the Derriford Hospital in Plymouth last year. It has destroyed the boy’s trust and confidence in doctorsAndrew Hannam, solicitor for the family The boy’s mother said: “We were incredibly shocked by what happened”, adding that Cdr Lambert was “someone who always believes he knows best”.The surgeon was prompted by a colleague to obtain parental consent before performing the genital procedure, and left the operating theatre to enter a waiting room where the the couple were seated. But he admitted leaving the room without speaking to the family or calling their name.In a letter of apology, Cdr Lambert, who received the OBE in 2013 for his work in Afghanistan, said:“Why I did not call your name when I left theatre to find you, I do not know. I unreservedly apologise for the short-fallings in the care I provided your son.”Plymouth Hospitals NHS Trust has also written to the family admitting the operation should not have taken place.The GMC were made aware of the matter but has not taken action.Mr Hannam said a claim would be brought against the trust. Cdr Lambert had previously asked the patient and his parents for permission to examine a minor problem in the boy’s genitals during a preoperative consultation, but they had refused.However, during the subsequent hernia operation, the surgeon not only conducted the examination but then carried out a procedure to “free adhesions”.Andrew Hannam, of Partner at Enable Law and solicitor for the family, said the extra operation should not have been performed without consent and prior counselling for the patient.“It has destroyed the boy’s trust and confidence in doctors and that’s something that once it’s lost is very hard to rebuild,” he told The Telegraph. The incident took place at Derriford Hospital in PlymouthCredit:APEX Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.