Green’s Dictionary of Slang

Barclay (and) Perkins n.

beer, stout.

1859		G.A. Sala Gaslight and Daylight 68: I know what Barclay and Perkins mean, I hope; — what Combe and Delafield — what Truman, Hanbury and Buxton — what Calvert and Co. [...] They all mean Beer.
1909		J. Ware Passing Eng. of the Victorian Era.