Well, I meant to post this weeks ago. But having just received a "you were got by a camera" letter it reminded me to do so when I needed to refer to it to try and second guess the likely outcome (72mph in a 60mph limit).

Link below to Association of Chief Police Officers. The page is full of publically viewable guidance documents, including one (near the bottom) on speeding points/fines etc.

http://www.acpo.police.uk/policies/index.html

(I'm sure someone who can be bothered can make it clicky)

 

Clicky

 

clicky

 

Beaten to it