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?