Triangulation is the second novel by English author Phil Whitaker it won the 2000 Encore Award, linked to the title of a love triangle between three young people's lives.

After retirement from the Ordnance Survey, John Hopkins travels from his home in Southampton to Dunsop Bridge in Lancashire (thought to be the geographical centre of Britain) where his old flame Helen Gardner lives.

The journey takes him over a day via train and then bus as he brings with him letters from his from his first job starting in 1957 working for the Directorate of Overseas Surveys at Tolworth in South West London.

His colleague Laurance Wallace joined at the same time but was shortly sent out to Africa to help survey the landscape using theodolites and later tellurometers.

John remained as a map curator in the Records Section and later the assistant of Brigadier Martin Hotine, where he found great satisfaction in his work.