One such is at Greystoke - (I think! This picture was taken by a friend and we omitted to make a record of where). It commemorates Lieutenant Edmund Hudleston, Royal Artillery, 6th son of William Hudleston of Hutton John, who died in 1889 at Padong in the eastern Himalayan Kingdom of Sikkim, famous for the great peak of Kangenjunga.
Road building undertaken by this mission was viewed with suspicion by Tibet and in 1886 some Tibetan militia occupied Lingtu in Sikkim near the Jelepla pass. In May 1888, the Tibetans attacked Gnathang below Jelepla but following the arrival of British reinforcements, including young Lt Hudleston, the Tibetans were pushed back.
Finally, in 1889, Claude White was appointed as the first political officer to the country and Chogyal Thutob Namgyal became a mere vassal of the Great White Queen. A further chunk of the world map went pink.
A memorial was built at Gnathang commemorating the British forces who died. If anyone is visiting Sikkim maybe they would get me a photo?