In a video statement late Wednesday, police named him as 68-year-old Clive Cressy, from Hove in East Sussex, the BBC reported.
Speaking to the camera, an officer said the charges included having sexual intercourse with underage girls, buying child prostitutes and molesting a child aged under eight.
The UK Foreign Office said it was aware a man had been arrested in Phnom Penh.
The footage was filmed by a local TV station as police searched his home, where they reportedly found a suitcase containing condoms, toys and girls' dresses.
It also showed pictures of the suspect's passport, which appeared to confirm his name and age.
The policeman said the suspect was arrested in the capital city after a police operation lasting months, reports the BBC.
Cressy is described in the video as a private doctor.
Checks with the General Medical Council could not find a record of his being registered as a practitioner in the UK.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.