Morning Boaty is it Saturday already lol. We have had a few "traveling" folks turned up on our local park yesterday, police have already been but will take 1 or 2 days for them to get evicted. Claimed that gate was unlocked, but I think angle grinder may have unlocked the gate.
When you use a sharp knife, the edge bends over a wee bit, the steel straightens that, but it can't put the edge back when it's worn down a bit, that's where the stone comes in.