Having run out of my supply of Esso Nuto H 44 oil, I was advised by Myfords that I could use any oil meeting ISO VG32 for the ML super7 bearings. I've picked up a can of Ambra brand oil locally, but it is labelled ISO VG32/46.
Presumably the definition VG32/46 means that the oil is suitable for requirements ranging from ISO VG32 all the way through to ISO VG46, and so it is therefore suitable for my needs. If not, I would be pleased to know before I use it! Thanks, Geoff Marshall