http://www.ehow.com/how_5712685_decode-stamper-numbers-vinyl-lps.html
Matrix numbers, also known as the run-off groove area, matrix area or dead wax, are etched onto the vinyl record between the final track and the label of the record. Usually each side has a different number. These numbers can sometimes tell you where the LP was made, if the matrix numbers end in -1, it can mean the record is a first pressing. They are utilized at the record manufacturing plant, but they are also studied and documented by record collectors, as they can sometimes provide useful information about the recording. The matrix numbers can include the catalogue number of the record (printed on the label or record jacket as well) and can include extra information which can be a cut or take number. It may also contain record plant codes, the initials or signature of the mastering engineer and cutting or copyright dates. They can also be an indicator of good sound quality in your vinyl, depending on the mastering plant or person involved with the release.
http://www.musicstack.com/answers/matrix-numbers-46663.html
Nightmare organic. You may get info direct from Parlaphone. You may be gone for some time. Looks like a first pressing. The value depends on the condition of both the sleeve and the record. Good Luck.