Being a subsidiary of EMI UK, EMI (Australia) would receive advice of upcoming UK releases with the option of importing copies, manufacturing copies locally, or ignoring altogether (only an option if the release had not charted highly in the UK). EMI (Australia) primarily manufactured Beatles records locally, releasing them through its Parlophone label.
In addition to releasing the core UK Beatles catalogue, EMI (Australia) exercised its discretion to issue its own locally-conceived Beatles records. EMI (Australia) learnt very quickly that as far as The Beatles were concerned, multiple releases were better than one: between 1963 and 1970, EMI (Australia) released 30 singles (of which 18 were "double A-sides"), 18 EPs and 17 LPs, against EMI UK's 22, 13 and 13 respectively.
UK Parlophone LPs added to the Australian Parlophone catalogue maintained the UK catalogue number, but with the Australian country code "O" suffixed to the mono and stereo prefix codes, for example, "PMC 1202" was catalogued locally as "PMCO 1202". LPs issued locally by Parlophone that were not on the UK Parlophone catalogue utilised a separate local catalogue number range, beginning at PMCO/PCSO 7500.
EMI (Australia) pressed both mono and stereo LPs throughout the 1960s, until declining sales led to the deletion of mono LPs—where stereo alternatives existed—in June 1969. By that time the mono releases of The Beatles and Yellow Submarine had sold a mere 5,000 and 1,300 copies respectively.
Like LPs, UK Parlophone extended plays (EPs) added to the Australian Parlophone catalogue maintained the UK catalogue number, but with "O" suffixed to the "GEP" prefix code. EPs issued locally by Parlophone that were not on the UK Parlophone catalogue, including UK titles with locally modified track lists, utilised a separate local catalogue number range, beginning at GEPO 70001.
Singles released in Australia on the Parlophone label were allocated a number in the 8000 range, starting with the letter "A". From A8083, all Parlophone single numbers ending with "3" were either used by, or reserved for, The Beatles. In March 1968, EMI (Australia) ended the separate cataloguing systems used on its in-house and distributed labels and created a unified numbering system, beginning at 8301. The 8000 series was chosen because Parlophone's catalogue—the highest range in use at the time—was then numbering in the low 8000s. 'Lady Madonna'/'The Inner Light' was the last Parlophone single issued under the old numbering system.
Please read Jaesen Jones' companion book, An Overview of Australian Beatles Records (available for purchase under the "References" menu), for more information.