Having a clearout, I've unearthed a couple of empty 250g CO2 cylinders from
a SodaStream machine.

Turns out they are now obsolete as far as Sodastream are concerned, as
their new machines use a different size cylinder, and they no longer
support or refill the old ones.

Does anybody else use these things these days, or are they literally
rubbish? If not, how I am supposed to get shot of them, given that the
local refuse collection centre refuses to take gas cylinders?

Landfill? - seems bizarre.

--
David