THE execution of British citizen Akmal Shaikh by China has sparked a diplomatic war of words between London and Beijing.

Convicted drug smuggler Shaikh, who is believed to have suffered from bipolar disorder, was killed by lethal injection despite pleas for his mental health to be considered.

Prime Minister Gordon Brown, who had telephoned Chinese premier Wen Jiabao to urge him to halt the execution, said he was “appalled and disappointed” at the failure to grant clemency.

Chinese officials in both capitals hit back with an insistence that Shaikh had “no previous medical record” of mental illness and a warning not to meddle in China’s judicial affairs.

The row culminated last night in a “difficult” showdown between Foreign Office minister Ivan Lewis and China’s Ambassador Fu Ying, after she was summoned to explain her country’s action.

Emerging from the meeting, Mr Lewis said he “made clear that the execution of Mr Shaikh was totally unacceptable and that China had failed in its basic human rights responsibilities”.

Shaikh, 53, from Kentish Town, north London, who was arrested in Urumqi, north west China, in September, 2007, was convicted of smuggling 4kg (8.8lb) of heroin into the country.

But it is widely believed by his family and supporters that he was seriously mentally ill and was duped into carrying the drugs unknowingly by a gang.