In Dad’s Army, Lance Corporal Jones, played by Clive Dunn, fought in six campaigns, from the Sudan in 1884 to the second world war. Well, my great-grandfather, Field Marshal Francis Grenfell, 1st Baron Grenfell, can beat that. He joined up at 18 in 1857 and stayed in the army for 65 years, until his death at 83, 100