Green’s Dictionary of Slang

(US) England.

1920		Newton 639th Aero Squadron 88: A representative of ‘Limy Land’ [HDAS].
1973		W. Burroughs Exterminator! 111: To keep the royal family [...] in Limey Land.
1989		H. Rawson Dict. of Invective (1991) 239: Naturally, limeys are said to come from limey land.
2005		postings to www.hostboard.com 27 June 🌐 I lived in Limey-Land when Blair came to power and I would have never thought that this would have happened [...] Oh, and please stop refering to the UK as ‘Limey Land’.