The blade's just a lump of angle iron welded to the shaft, it's no big deal when it wears out.
So which parts came from a Metro?
I saw an ultrasonic bottle breaker on 'It's hard to be green' or something like that, with Dick Strawbridge, and thought that was a great idea then. He used the bits as a thermal store for the greenhouse.
This would certainly keep the recycling bin less full.
?What is the blade?
Could do with a guard over the bin and the top of the inlet.