Late to the discussion (and in no way a knife expert) but someone mentioned Spyderco a few pages back and I am happy with their “UK penknife” model that they designed to be UK EDC legal (though I know that’s not relevant to you). It folds and can easily be opened one handed but it doesn’t technically lock - it just has a pressure bar that gives it a click/notch that you have to overcome. It’s a neat design. Solid, light, plenty sharp enough (for me certainly).
Late to the discussion (and in no way a knife expert) but someone mentioned Spyderco a few pages back and I am happy with their “UK penknife” model that they designed to be UK EDC legal (though I know that’s not relevant to you). It folds and can easily be opened one handed but it doesn’t technically lock - it just has a pressure bar that gives it a click/notch that you have to overcome. It’s a neat design. Solid, light, plenty sharp enough (for me certainly).