There were three series of Peacock record, all roughly from the same period and the label design was almost identical for all three.

The P-100 series were pressed from Panachord and Winner masters owned by English Decca or Brunswick. The series may have reached P-200, (the highest known to date is P-199). Generally all were issued under pseudonyms, though there are exceptions, (some of the last few issues used the correct artist's name), and all were generally also available on the more usual issues of Brunswick, Decca, Panachord or Winner, though I have a couple which don't seem to have been otherwise issued in Britain; there may be others.

The BP-600 series were pressed by British Homophone using their Sterno masters. The extent of the series is unknown; the highest number reported is BP-637. All were also available on Sterno and all were issued under pseudonyms.

Thirdly, an 8" series also using British Homophone masters, from their Plaza label, were also available and were in a PS-200 range; the highest number yet reported is PS-278. All were also available on Plaza and all were issued under pseudonyms.

Finally: I've never seen a Peacock record sleeve; do they exist?