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Well, it's loosened off twice now so it's likely to only get worse and I hate not having a vice at home, they're so fucking handy.
Shropshire? Is that anywhere near this:
What's a good G clamp?
hippy-
I'm in the Clee Hills, about 25 miles up from Leominster.
Eclipse spring to mind if you want 'good', but almost any with a cast frame and Acme thread will be fine - avoid pressed steel or plastic frames, and don't forget to allow for the thickness of protective packing pieces when working out what size you need.
MrE
I think the problem with the type of vice at the start of this discussion is the position of the clamp - it's unlikely to stand 50Nm around the axis of the clamp unless you tighten it so much it will damage the table, especially with the clamp being relatively close to the edge.
Fixing a vice to a board, and using a pair of G clamps should get round this - clamping off axis will be better, the larger area will avoid marking the table top, and suitable packing pieces underneath should prevent the clamps from damaging the underside of the table.
Can you cut up one of the kitchen cupboard doors? Glue and screw together to make something thick enough to recess the heads of bolts, and use offcuts to protect the underside of the dining table. Possibly use plain bolts and washers rather than coach bolts - this will make it easier to take apart for storage.
This is starting to sound like a project in it's own right - if it's for a one off job then offering beer money to someone who owns a vice will probably be quicker and cheaper. You can use mine, but I'm in darkest Shropshire...