This two week thing is rubbish. It could be laying around on someones desk for a while then get put into the system, you'll still be brought up for speeding.
If it doesn't come after a while (few months) it's probably safe to say they might not have got you or it's not been possible to put through the fpn info, and Learn from it.
Yes it could have been laying around on a desk for a while and still be sent out to the registered keeper of the vehicle, however my understanding of the law having studied this is that unless you have A: Changed your address recently, or B: Drive a company car, or C: Been stopped by a police officer for speeding, then you cannot legally be charged with speeding if the ticket has not been received by the owner within 14 days.
Of course, that won't stop them from trying. As a police officer yourself you may have better knowledge about this than I do, but it seems pretty clear that (if challenged in court) most cases will be thrown out if the ticket has not been received by the registered keeper within 14 days of the offence, providing that there is no reasonable excuse for the delay, such as a recent change of address, company car, etc.
To rlees I'd say don't worry about it, I'm pretty sure you'll be fine so long as you own the vehicle, you were snapped by a GATSO/van, and you haven't changed address anytime recently. If you still get a ticket it will be an easy one to challenge, no solicitor need be involved if you do your homework. As said before, see pepipoo for more info.
Oh and for the people who feel you should not challenge a speeding ticket, it all depends upon individual circumstances. If your driving dangerously in a way that would enganger other road users, then you obviously deserve to get caught.
Problem is, if everybody on this website is driving every day for a period of say 30 years, for example, every single one of us will probably get a speeding ticket at some point during that period of time.
I'd say that (thankfully) a very small minority of people on here drive dangerously, however, every single one of us speed at some point. I think its too easy to just say "accept it and learn from it" because everybody here will break the speed limit by some degree and wouldn't learn a thing from a speeding ticket other than to look out for speed cameras more carefully in future!
The way that speed camera partnerships are run, I'd say that around 30% of all speeding tickets from a GATSO or van will have some kind of descrepancy on which a legal challenge could be mounted.