How interesting, thanks Paul, so the registrant wasn't Allen and Hanbury / Allenbury's at all, even though the RD no was on their packaging.
RH Dowell and RS Dowell of John Dowell and Sons are listed as ordinary members of The Society of Glass Technology (1919 and 1921 - possibly other dates too but those are the only lists I've found online so far). [archive.org]
Grace's Guide gives:
John Dowell and Sons of Leagrave Works, Chatsworth Road, London, E5 (Glass Bottle Manufacturers). 1922 Listed Exhibitor. Manufacturers of Plain and Stoppered Bottles for Chemical, Medical, Perfumery and all Trades. Also Babies' Feeding Bottles. (Stand No. G.52)
and
1951 Directory for the British Glass Industry: Companies D
DOWELL (JOHN) & SONS (GLASS BOTTLE MANUFACTURERS) LTD., LEAGRAVE WORKS AND GLOBE WORKS, CHATSWORTH ROAD, LONDON, E.5. T.A., "Acetized, Easphone, London". T.N. AMHerst 1515, 2219 (2 lines), and 1744. Established 1912. Five furnaces: oil; coke. Bottles and jars for medical and pharmaceutical, toilet and cosmetics, druggists and drysalters trades; feeding bottles; droppers; grinding and drilling. Directors: R. G. Dowell (Governing); E. C. Higgs; E. G. Gough. Secretary: E. A. Cox.
So, Dowell's made the feeding bottles and
Allen and Hanbury made the baby feed that went into them.
