Dear Old Blighty

I make liberal use of the word Blighty. I assumed it to be a relic from the days of the Raj and was curious as to its exact origins. Wikipedia defines Blighty as…

…an English slang term for Britain deriving from the Hindustani word vilāyatī (pronounced bilāti in many Indian dialects and languages) meaning ‘the country’, a word which itself is derived from the Arabic word wilayat meaning a ‘kingdom’ or ‘ministry’.

Well, fancy that.