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@Butters
Ok so a standard cartridge BB / square taper crank setup.
Tighten up the crank bolts and see what happens. If it still feels loose, it could be that the BB had a knock and is dead. If this is the case, you will see the BB spindle moving with the crank arms when you wobble it. I guess the tapers could have got buggered up, but I think it's pretty unlikely.
What a day for a little test ride!