The signs need a pair and if lit then both need to be lit - so if one has failed then they are invalid.
You must hear within 14 days unless your vehicle is Company owned (or other company linked like on HP etc) then it could be up to 6 mths!
Often that instinct to brake can help you too, as so far from my experience, that sudden drop in speed makes it really hard for any LTi camera that I have tested to be able to get a fix. (This is not any official testing, just private, you understand).
If they hadn't broken the 85%ile speed limit setting with 'average mean' then the road speeds would be about right for the speed that you generally feel comfortable with. It is only because the road speeds have now been artificially lowered, and as such many drivers who might otherwise travel within the SAFE 85%ile are now 'illegal' and thus open to prosecution!
Cant say that you will get any 'training' perhaps indoctrination !
After the 4th year you can and should request a new clean licence.
I am surprised that they don't increase the entire point system to try and cater for all the extra points that they know people are accruing on their licences! Although I dare say to do this would indicate an element of guilt on their part, as to the un-necessary cause of all the additional points. After all if 'speed' was so bad as they would have you believe then how come we don't have total carnage on the road with ALL these people still speeding about ? They have no answer to this, nor to where is all the volume and density testing ! and so on !
Just disgusting as while they focus people on this they are ignoring the true real road safety messages and will improve road safety!
They misguiding will tell you 30% of accidents are 'caused' (!!) by speeding - wrong 6% of accidents have speed as a 'factor' not a cause ! That's it and we can guesstimate that half of those are WITHIN the speed limit! (too fast for conditions and excessive speed).