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https://www.worldofbrass.co.uk/shop/products/delamain_heavy_duty_mortice_latches.htm
these folks have all sorts of sizes and dimensions which i've used before
terlg
@aggi
Cheers @absurdbird and @Airhead Ironmongery Direct did have more info on the dimensions so I've managed to find one on there that should fit. The 5 mm spindle was for a bathroom lock which was the problem.