John Joseph Alty, originally from Glasgow, was escorted to Bangkok International Airport by immigration police at the weekend after the UK Border Agency (UKBA) told Thai police he was suspected of the crime.
The 57-year-old, who ran a guest house called The Squealing Pig in the coastal town of Hua Hin, 180 miles south of Bangkok, returned to Britain "voluntarily" after paying for his own ticket while being held in custody. All deportees have to buy their own tickets.
Mr Alty, also known as Jack, was arrested at his guest house in May after a UKBA official in Bangkok acted on information received by the agency and notified Thai Immigration Police of his whereabouts.
The UKBA said the information was passed on for "law enforcement purposes only" and for the Thai immigration authorities to consider "the suitability of Alty to remain in Thailand".
A letter from the UK authority to Thai immigration officials stated: "Alty is currently suspected of involvement in the smuggling of Sri Lankan and Iranian nationalities into Australia and New Zealand.
"On several occasions people of these nationalities seeking entry to Australia and New Zealand have attempted to travel on passports in the name of Alty."
The letter further requested its contents "remain confidential and not be released to a third party or the media".
However, details of the letter were released at a press conference in Bangkok, where immigration police said he would be deported as he is believed to be a "danger to society".
