<P> The film is based on a story heard by Christopher Monger from his grandfather about the real village of Taff 's Well , in the old county of Glamorgan , and its neighbouring Garth Hill . Due to 20th century urbanisation of the area , it was filmed in the more rural Llanrhaeadr - ym - Mochnant and Llansilin in Powys . The Welsh Male Voice Choir used to provide background music throughout the film was , in fact , the London - based Gwalia Male Choir . </P>
locations for the film an englishman who went up a hill
Llanrhaeadr - ym - Mochnant and Llansilin in Powys