40th Regiment of Foot

Chronology

1717 raised as Richard Philipps's Regiment of Foot
1747 ranked as 40th Foot
1751 became the 40th Regiment of Foot
1782 became the 40th (the 2nd Somersetshire) Regiment of Foot
1881 united with 82nd Regiment of Foot to form The Prince of Wales's Volunteers (South Lancashire Regiment)
1938 became the South Lancashire Regiment
1958 amalgamated with The East Lancashire Regiment to form The Lancashire Regiment (Prince of Wales's Volunteers)
1970 amalgamated with the 1st Battalion, The Loyal Regiment (North Lancashire), to form the 1st Battalion, The Queen's Lancashire Regiment
2006 merged with the King's Regiment and the King's Own Royal Border Regiment to become 1st Battalion Duke of Lancaster's Regiment (King's Lancashire and Border)

40th Regiment of Foot Wikipedia
South Lancashire Regiment Wikipedia
Lancashire Regiment Wikipedia
Duke of Lancaster's Regiment Wikipedia
Queen's Lancashire Regiment Wikipedia
The South Lancashire Regiment (Prince of Wales's Volunteers) including deployments Regiments.org, an archived site.
Lancashire Infantry Museum, includes the East Lancashire Regiment (30th and 59th of Foot), the South Lancashire Regiment (40th and 82nd of Foot), the Loyal North Lancashire Regiment (47th and 81st of Foot)
Note about the Afghan War Cemetery at Quetta by H Bullock, situated near the village of Kasi , two miles from Quetta. Contains men who died during the 1st Afghan War. Lists four names and advises a large number of NCOs and men of the 40th Regiment of Foot were buried here. Notes and Queries Volume CLXIII, Issue Oct 29 1932, page 312
“The Regimental History of the Duke of Lancaster’s Regiment” army.mod.uk

The constituent regiments are the 4th, 8th, 30th, 34th, 40th, 47th, 55th, 59th, 63rd, 81st, 82nd and 96th Regiments of Foot.