What does the letters n. g.p.t mean on an old marraige certificate after the grooms occupation?
Probably nothing more sinister than the initial letters of his employer, a prominent local factory. Railway employees often had letters such as “GER” added after their occupation to indicate which of the railway companies they worked for. I saw one once where the Royal Ordnance factory in Enfield had been abbreviated to its letter forms, so it does happen where the actual employer is named, especially if it is a large local concern owned by a wealthy member of the gentry. It was up to each indvidual vicar as to how throrough they were. It could reflect some kind of now defunct professional guild of merchants (National Guild of Profesional Tradesmen perhaps – it does fit!), but I don’t think so.