Hi Jos - I think things like 111 and *555 should be used to their fullest extent. We shouldn't have to be thinking about the etiquette of it all, whether lines are tied up etc - they should have filters built into their protocols so that the decision whether services are tied up is made by people who are paid to have the intelligence and time to think about it.
We don't have time to think about it - when you're following a suspected drunk it should be a no-brainer - dial 111 (that's what you've been told is the right thing to do so that's what I'll be doing from now on).
Personally I don't worry too much if I get it wrong, perhaps misconstrue someone's overheated engine. Apologies to the police - it's nothing personal, and I'm coming from good intentions - but if I am seriously concerned I'd rather waste some police time than risk wasting a family.
Keep up your tremendous work Jos - there are loads of us out there supporting you even if it's just with our thoughts. I can never listen to Brothers in Arms now without going to a pretty intense place, you're amazing.

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