Hi Phillip,
There have been many calls of this nature in the past, they always claim to be from a "safety" journal or "police" journal, "ambulance" magazine - it's disgusting really!
I very much doubt you will receive anything in the post - they always try to make you feel like you have already booked an advert (like any of us would forget agreeing to this!!).
Ignore and spread the mesaage so no fellow members get scammed is the best advice here.
Mitch.