Green’s Dictionary of Slang

1. peculiar, strange.

1859		Hotten Dict. of Modern Sl. etc.
1978		Maledicta II:1+2 (Summer/Winter) 118: Elsewhere Aylwin lists a few more ‘Vulgarities’: [...] queer (Brighton Pier, though often in the sense of ‘peculiar’ rather than what Aylwin calls a ‘puff’, collar and cuff).
2003		B. Dark Dirty Cockney Rhy. Sl. 36: Chelsea pier odd.

2. homosexual; thus Brighton, a homosexual.

1960		J. Franklyn Dict. of Rhy. Sl.
1969		S.T. Kendall Up the Frog.
2003		B. Dark Dirty Cockney Rhy. Sl. 31: I wouldn’t go into that bar if I was you; it’s full of Brightons. [Ibid.] 36: Chelsea pier queer.