Using SQL from the measure definition for the denominator for this measure in OpenPrescribing, a bnf codelist was built in BigQuery, which also removed any drugs from the denominator which was also in the numerator, leaving only lower OME products:
select presentation_code, presentation
from hscic.bnf
where (presentation_code LIKE '0407020A0%AE' OR
presentation_code LIKE '0407020A0%AF' OR
presentation_code LIKE '0407020A0%AG' OR
presentation_code LIKE '0407020A0%AH' OR
presentation_code LIKE '0407020A0%AU' OR
presentation_code LIKE '0407020A0%BW' OR
presentation_code LIKE '0407020AD%AF' OR
presentation_code LIKE '0407020AD%AG' OR
presentation_code LIKE '0407020AD%AH' OR
presentation_code LIKE '0407020AD%AI' OR
presentation_code LIKE '0407020AD%AK' OR
presentation_code LIKE '0407020AD%AP' OR
presentation_code LIKE '0407020AD%AQ' OR
presentation_code LIKE '0407020AD%AR' OR
presentation_code LIKE '0407020AD%AS' OR
presentation_code LIKE '0407020AF%AA' OR
presentation_code LIKE '0407020AF%AB' OR
presentation_code LIKE '0407020AF%AC' OR
presentation_code LIKE '0407020AF%AD' OR
presentation_code LIKE '0407020AG%AC' OR
presentation_code LIKE '0407020AG%AD' OR
presentation_code LIKE '0407020AG%AE' OR
presentation_code LIKE '0407020AG%AF' OR
presentation_code LIKE '0407020AG%AG' OR
presentation_code LIKE '0407020B0%AE' OR
presentation_code LIKE '0407020B0%AF' OR
presentation_code LIKE '0407020B0%AG' OR
presentation_code LIKE '0407020B0%AH' OR
presentation_code LIKE '0407020B0%AI' OR
presentation_code LIKE '0407020B0%AJ' OR
presentation_code LIKE '0407020Q0%AG' OR
presentation_code LIKE '0407020Q0%AH' OR
presentation_code LIKE '0407020Q0%AI' OR
presentation_code LIKE '0407020Q0%AK' OR
presentation_code LIKE '0407020Q0%AL' OR
presentation_code LIKE '0407020Q0%CF' OR
presentation_code LIKE '0407020Q0%CG' OR
presentation_code LIKE '0407020Q0%CP' OR
presentation_code LIKE '0407020Q0%CV' OR
presentation_code LIKE '0407020Q0%DC' OR
presentation_code LIKE '0407020Q0%DD' OR
presentation_code LIKE '0407020Q0%DE' OR
presentation_code LIKE '0407020Q0%DU' OR
presentation_code LIKE '0407020Q0%DV' OR
presentation_code LIKE '0407020Q0%DW' OR
presentation_code LIKE '0407020Q0%DZ' OR
presentation_code LIKE '0407020Q0%EA' OR
presentation_code LIKE '0407020Q0%EB' OR
presentation_code LIKE '0407020Q0%EF' OR
presentation_code LIKE '0407020Q0%EG' OR
presentation_code LIKE '0407020Q0%EH' OR
presentation_code LIKE '0407020Q0%EI' OR
presentation_code LIKE '0407020Q0%FL')
AND presentation_code NOT IN ('0407020A0AAAFAF',
'0407020A0AAAGAG',
'0407020A0AAAHAH',
'0407020A0BBABAF',
'0407020A0BBACAG',
'0407020A0BBADAH',
'0407020A0BBAJAF',
'0407020A0BBAKAG',
'0407020A0BBALAH',
'0407020A0BDABAF',
'0407020A0BDACAG',
'0407020A0BDADAH',
'0407020A0BEACAF',
'0407020A0BEADAG',
'0407020A0BEAEAH',
'0407020A0BFACAF',
'0407020A0BFADAG',
'0407020A0BFAEAH',
'0407020A0BGABAF',
'0407020A0BGACAG',
'0407020A0BGADAH',
'0407020A0BHABAF',
'0407020A0BHACAG',
'0407020A0BHADAH',
'0407020A0BLABAF',
'0407020A0BLACAG',
'0407020A0BLADAH',
'0407020A0BMABAF',
'0407020A0BMACAG',
'0407020A0BMADAH',
'0407020A0BQACAF',
'0407020A0BQADAG',
'0407020A0BQAEAH',
'0407020A0BRACAG',
'0407020A0BRADAH',
'0407020A0BRAEAF',
'0407020A0BRAHAF',
'0407020A0BRAIAG',
'0407020A0BRAJAH',
'0407020A0BRAMAF',
'0407020A0BRANAG',
'0407020A0BRAPAH',
'0407020A0BUACAF',
'0407020A0BUADAG',
'0407020A0BUAEAH',
'0407020A0BVACAF',
'0407020A0BVADAG',
'0407020A0BVAEAH',
'0407020ADAAAHAH',
'0407020ADAAAIAI',
'0407020ADAAAPAP',
'0407020ADAAAQAQ',
'0407020ADBCACAH',
'0407020ADBCADAI',
'0407020ADBCAFAP',
'0407020ADBCAGAQ',
'0407020ADBDADAH',
'0407020ADBDAEAI',
'0407020ADBEADAH',
'0407020ADBEAEAI',
'0407020ADBEAFAP',
'0407020ADBEAIAQ',
'0407020ADBFADAH',
'0407020ADBFAEAI',
'0407020ADBFAIAH',
'0407020ADBFAJAI',
'0407020ADBGADAH',
'0407020ADBGAEAI',
'0407020ADBIABAH',
'0407020ADBKADAH',
'0407020ADBKAEAI',
'0407020ADBKAHAQ',
'0407020ADBLABAI',
'0407020ADBLADAQ',
'0407020ADBLAEAH',
'0407020ADBMAEAH',
'0407020ADBMAGAQ',
'0407020ADBMAHAI',
'0407020ADBNAAAI',
'0407020ADBNABAH',
'0407020ADBPAEAH',
'0407020ADBPAFAQ',
'0407020ADBPAGAI',
'0407020ADBQACAH',
'0407020ADBQADAI',
'0407020ADBRAFAH',
'0407020ADBRAGAQ',
'0407020ADBSAFAH',
'0407020ADBSAGAQ',
'0407020ADBSAHAI',
'0407020ADBTAFAH',
'0407020ADBTAGAQ',
'0407020ADBTAHAI',
'0407020AFAAADAD',
'0407020AFBBADAD',
'0407020AFBCACAD',
'0407020AFBDADAD',
'0407020AGAAAFAF',
'0407020AGAAAGAG',
'0407020AGBBAFAF',
'0407020AGBBAGAG',
'0407020AGBCAEAF',
'0407020AGBCAFAG',
'0407020B0AAAFAF',
'0407020B0AAAGAG',
'0407020B0BDABAF',
'0407020B0BDACAG',
'0407020B0BGABAF',
'0407020B0BGACAG',
'0407020B0BIABAF',
'0407020B0BIACAG',
'0407020B0BJABAF',
'0407020B0BJACAG',
'0407020B0BNABAF',
'0407020B0BNACAG',
'0407020B0BPABAF',
'0407020B0BPACAG',
'0407020B0BSABAF',
'0407020B0BSACAG',
'0407020B0BTABAF',
'0407020B0BTACAG',
'0407020Q0AAAGAG',
'0407020Q0AAAHAH',
'0407020Q0AAAIAI',
'0407020Q0AADCDC',
'0407020Q0AADDDD',
'0407020Q0AADEDE',
'0407020Q0AADUDU',
'0407020Q0AADVDV',
'0407020Q0AADWDW',
'0407020Q0AAEBEB',
'0407020Q0AAEHEH',
'0407020Q0AAEIEI',
'0407020Q0BBACAI',
'0407020Q0BBADAH',
'0407020Q0BBAEAG',
'0407020Q0BBAHDC',
'0407020Q0BBAIDD',
'0407020Q0BBAJDE',
'0407020Q0BIADDV',
'0407020Q0BIAEDW',
'0407020Q0BIAFEI',
'0407020Q0BJACEB',
'0407020Q0BKACEH',
'0407020Q0BKADEB',
'0407020Q0BKAEEI',
'0407020Q0BMACAI',
'0407020Q0BMADAH',
'0407020Q0BMAEAG',
'0407020Q0BNACAI',
'0407020Q0BNADAH',
'0407020Q0BPACAI',
'0407020Q0BPADAH')