Hello!
Nowadays....
- It usually takes 2 weeks to receive the TP's thank you letter
(sometimes a bit sooner, sometimes a bit later). Sometimes never
arrive also, if you're very lucky (did you see the flash?).
Understand, however, that its considered a serious offence - 12
points + possibility to be charged in court (although I think
hardly anyone actually goes to court for it unless an accident
happens).
- I heard of people getting warning letter for speeding recently,
but only if they were over the speed limit by a bit (1-20 kmh),
probably closer to the 1 kmh side). I believe the letter also
mentions that if the person gets another warning, they may decide
to serve a summons instead.
- Having demerit points does not affect road tax. If you don't have
demerit points, you may get additional 5% off insurance price.
Otherwise, it doesn't affect NCD or insurance at all.