Takes a while to receive it.
They are getting more aggressive about this & reducing the threshold leeway offered to motorists as well. The new camera vans are being stealthily placed on bridges so you can barely see them from the road but the new laser cameras are able to pick you up a very long way away & by the time you reduce speed they have already got you!
Also, they only need to post it within 14 days if it takes longer than 14 days to receive due to slow post then its still enforceable so technically you could get it within a month & still be done for it!
So if i've read it correctly, this happened on the 16th, so if I say the clock started on the 17th (day of incident doesn't count apparently) they need to have written it up and sent it no later than 23:59 on the 31st (yesterday)? With it being a Saturday the PO won't have done anything with it, and won't do until Monday, so safe to say I could still expect it this week 2nd - 6th? I'd assume if i've not gotten it after that i've dodged a bullet?
	
 
 The way the camera van was parked was so crafty it was barely visible to your line of sight just slightly appearing over the concrete bridge wall but just enough to catch lots of motorists out 
 as I got close to it I could clearly see the massive camera lens. When coming back the same route a few hours later the vehicle was not even visible from the other side of the road until after you had passed it so anyone speeding on that side would have been caught out immediately as no way to see it at all as the bridge wall totally concealed it until after you had passed under the bridge!
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 yet few proper traffic cops anymore so they get away with it as under the limit or no cameras around (except dashcams of other drivers).