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@SpamJav
You'll need a crank arm puller and (probably) a 14mm socket wrench first. Once the cranks are off, maybe you can loosen the lock ring by hand? You could probably loosen it with a screwdriver (Be gentle!) as for the other side (can't really see it under the grime!). It might be possible to unscrew with a wrench, though it's very hard to get enough grip on such a narrow surface. Why not get the cranks off, then take it down to a halfords and use their tools?