I'm sure you lot have had enough of these so worth asking here

Recently received my 1st NIP (in 13 years!) through for allegedly doing 40mph in a 30mph, the 30mph of which is on the A583 at Blackpool (straight off a 70mph motorway) which itself is a dual carriageway, yet its 30mph?!

Anyway, I requested the image and calibration certificates which I've been sent, however the image doesnt show a speed on it (but Lancashire Police verbally say they DO have one showing 40mph which they will send me, but confused why they didnt in the 1st place?!) and the calibration certificate is annual, not the daily check I thought I would receive (only provided at court apparently).

I've already returned the NIP signed to say its me who was driving the vehicle that day, but not happy that a dual carriageway off a motorway is 30mph in the 1st place and dont believe there is enough signs to warn people of this, and also, the mobile camera that got me was sited right next to a fixed GATSO (which wasnt working) yet I dont recall any signs being displayed that a mobile camera was in use.

I've requested various questions be answered under the Freedom of Information Act regarding the speed restrictions and this, that and the other, but so far not received a response and its now passed the 20 days that they should respond in.

Any advice as I'm not happy to just send £60 and receive 3-points, I normally like to fight things but equally dont want to end up much worse off if still likely to lose in court!

Cheers,