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122mm is Stronglight.
Hilary Stone has a few rings around 46t/47t for ~£30, which would be better for fixed than +50t.
He's got a good stash, but is generally a little pricey so you might have better luck on eBay or Retrobike.
PS Your searches might find ads from Hilary on LFGSS: he's no longer active on here so don't bother trying to contact him via the forum.
Scilly.Suffolk
@dirac
Managed to get some more time to spend on the bike. Confirmed to be 122BCD by both methods of measurement. Will fit the cranks back on to the BB and measure the chainline etc to get an idea of how much I need to adjust...