Typically local authorities refuse extinguisher in the bin as they’re a hazard to the bin men – but the should accept them at recycling centres – shame yours doesn’t
Water you can just discharge and put it in the scrap metal bin at the recycling centre – its now longer an extinguisher.
Powder – find some sort of fabric bag / receptcle (tie a knot in the end of an old pair of trousers perhaps). Turn the extinguisher upside down and discharge it into the bag. Throw the bag in the bin and the extinguisher is now scrap as well. Keep the powder away from anything electric/electronic – they’re not reccomended for home use any more as the powder finds its way in to electrical goods, attracts moisture and ruins them
Foam can be more problematic as you mustnt let it reach a water course – it needs to go to a foul sewer – but you;’ll easily overwhelm your loo! Any company that offers to service extinguishers will take them away for a small fee though
The FIA one…. stick it on Ebay – its ‘memorabilia”…. and someone else’s problem 🙂