That (404452) is a valve from the original netaheat (16-22) which had individual gas valve, governor and FSD, connected together via ct nipples.
Not seen one of them for years.
I suspect the OP did not find a valve as all the replies referred to a MkII valve which was a monoblock White Rogers unit as has been said the MkI had separate components and extremely rare!!
I suspect the OP's boiler ended up in a skip (where it deserved to be!)
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