Authorities in Thailand have detained the British husband of a Thai woman whose body was found in remote English hill country more than 20 years ago.

The lifeless body of Lamduan Armitage -- nee Seekanya -- was found by hikers in the Yorkshire Dales in 2004.

But she remained unidentified, known only as the "Lady of the Hills", the mystery enduring until a fresh police appeal in 2019 led to her family in Thailand coming forward.

Thai immigration police said a 62-year-old British man was detained at a house in the western province of Kanchanaburi on Friday for breaching visa conditions.

"Immigration officials decided to revoke his visa and he was detained, before Thailand proceeds with the next steps in international cooperation on criminal acts," immigration police said in a statement on Saturday.

Thai officials and North Yorkshire Police confirmed the man was David Armitage, Lamduan's husband.

North Yorkshire Police, which is leading the investigation into Lamduan's death, sent a team of detectives to Thailand last year to meet Lamduan's family after her identity was confirmed through DNA testing.

In a statement on Saturday, a spokesperson said North Yorkshire Police was aware of Armitage's detention in Thailand.

"Should Mr Armitage be deported, we understand that he will have a choice as to where he goes, which will include return to the UK," the spokesperson said.

"Should that occur, we will again make every effort to speak to him about the investigation."

The BBC reported that police are not certain how mother-of-three Lamduan died.

(AFP)

After Lamduan's disappearance, Mr Armitage (pictured with his daughter Charlena) returned to Thailand.

Thailand detains British husband in 'Lady of the Hills' mystery