Green’s Dictionary of Slang

Harry Lauder n.

[rhy. sl.; ult. the Scot. music-hall star Harry Lauder (1870–1950)]

1. a prison warder.

[UK]Partridge DSUE (8th edn) 533: since ca. 1905.
[UK]R. Puxley Cockney Rabbit.

2. (Aus.) order, decorum.

[Aus]J. McNeill Old Familiar Juice (1973) 83: bulla: Orright! Orright! [...] Let’s have a bit of Harry Lorder, a bit of decorum, if yer please!