The Englishman Who Went Up a Hill But Came Down a Mountain is a 1995 film written by Ivor Monger and directed by Christopher Monger.
The movie is based on a story heard by Christopher Monger from his grandfather about the real village of Taff's Well (Ffynnon Taf in Welsh). Due to 20th century urbanisation of the area, it was filmed in the more rural Llanrhaeadr-ym-Mochnant and Llansilin in Mid Wales.
The movie is set in 1917 (with World War I in the background) and revolves around two English cartographers, the pompous Garrad and his junior, Anson (Hugh Grant), who arrive at the Welsh village of Ffynnon Garw ("Rough Fountain" in Welsh) to measure its "mountain" – only to cause outrage when they conclude that it is only a hill because it is slightly short of the required 1000 feet.
The villagers, aided and abetted by the wily Morgan the Goat (Colm Meaney) and the Reverend Jones conspire to delay the cartographers' departure while they build an earth cairn on top of the hill to make it high enough to be considered a mountain.
The Englishman Who Went Up a Hill But Came Down a Mountain. Wikipedia.
The Englishman Who Went Up a Hill but Came Down a Mountain: A Novel