Ignoring the pedantry of Willk & Poly ...surely if 'we' ( a collective of boat users) choose to carry pyro flares we must also take responsibility or disposing of them safely ?
They are in effect a controlled explosion in a tube - so never to be used or handled without respect .
'We' (down south) are lucky to have places close to dispose of them. I've happily taken a small arsenal of TEP to the RNLI in Poole for ribnetters. The RNLI get charged to dispose of them but are still very helpful despite the fact that some of what they get given I felt nervous looking at let alone handling !
Its a re-occurring debate about their usefulness - the advent of DSC & PLB covering most situations a pyro flare could be needed.
If anyone has TEP and wants them correctly disposed of PM me - arrange to meet me or come on the Nacho run etc and I'll take them & swing by the RNLI for you ( which I can do in my lunch hour)
However unless you are down south this might be that helpful.