A British soldier's postcard to his sweetheart has finally arrived — 92 years after he sent it from the trenches of the First World War.

Pte. Walter Butler wrote to Amy Hicks in 1915 telling her he was alive and well but the postcard never made it to her home in Wiltshire, 100 kilometres west of London.

Butler survived the war and the couple were married.

The postcard turned up in a postal sorting office, which sent it along last week to the post office near Hicks's address.

A local postman called the home of the couple's daughter, Joyce Hulbert, to announce the discovery.

Hulbert, 86, a grandmother of three, says her late parents rarely discussed the war and the relic of the past has little meaning for her.

She wonders what the fuss is all about, saying there are more interesting things going on than a postcard arriving 92 years late.