Barley Wine

It's funny what you stumble across when looking for something else. This is something I found with a search for Whitbread's Porter.

Various British beers
Year	Brewer	Country	Beer	Style	Acidity	FG	OG	ABV	attenuation
1870	Allsopp	UK	Burton Ale	Strong Ale	0.32	1040.38	1121.6	10.64	66.80%
1870	Bass	UK	Barley Wine	Barley Wine	0.23	1032.31	1114.8	10.84	71.85%
1870	Unknown, Edinburgh	UK	Edinburgh Ale	Scotch Ale	0.19	1006.63	1048.4	5.45	86.30%
1870	Guinness	Ireland	Extra Stout	Stout	0.24	1015.51	1078.1	8.20	80.13%
1870	Truman	UK	Porter	Porter	0.24	1013.16	1051.3	4.96	74.36%
1870	Whitbread	UK	Porter	Porter	0.18	1014.04	1054.1	5.21	74.05%
1870	Hoare	UK	Porter	Porter	0.18	1012.99	1052.4	5.13	75.22%
1870	Perry	Ireland	Ale	Ale	0.14	1006.48	1045.8	5.13	85.86%
Source: A dictionary of chemistry and the allied branches of other sciences, Volume 6 by Henry Watts, 1872, page 256