UK pressing plant of The Decca Record Company Limited, based in New Malden, Surrey, UK.
UK pressings can be specifically ID'd by the use of the 'BUCKINGHAM' 10-digit alpha code (1 to 0 respectively) for stampers at 3 o'clock on vinyl. Matrices are usually stamped horizontally at 6 o'clock, with numerical Mother at 9 o'clock. Any Tax Code is likely found at 12 o'clock.

Decca Stamper # info (at 3 o’clock)
(The best pressing will of course be a single letter).
1-10 B U C K I N G H A M
11-20 BB BU BC BK BI BN BG BH BA BM
21-30 UB UU UC UK UI UN UG UH UA UM
31-40 CB CU CC CK CI CN CG CH CA CM
41-50 KB KU KC KK KI KN KG KH KA KM
51-60 IB IU IC IK II IN IG IH IA IM
…
111-120 BBB BBU BBC BBK BBI BBN BBG BBH BBA BBM
121-130 BUB BUU BUC BUK BUI BUN BUG BUH BUA BUM
(and so on)

For the jazz LP pressings in the 1950’s and 60’s Decca stamped in a straight line - usually 'VMGT' followed by four-digit number, a '1' followed by a letter which is code for the identity of the mastering engineer.

Decca's mastering was usually accomplished at Decca Studios and the Decca engineer IDs (or aliases) can be found in runouts, as listed there.
After Decca's acquisition by Polydor the plant was closed in 1979 and pressings transferred to Europe.