A more general aspect is that I don't like the "price for the offence" system that so many offences seem to have.
Quiet a few offences are always deliberate and conscious choices by the offender. For example, doing 36 mph in a 30 limit could happen through a lapse of concentration and be aggravated by other factors (e.g. driving in a queue of traffic all doing 36 mph, etc. - does not make it right but it is not always a conscious deliberate choice. But picking up your mobile whilst driving to send/read a tweet/text/whatever is a deliberate choice - you have to think to do it. So having a narrow range of penalties seems weird. I would prefer a system of fast escalating penalties e.g. where it's a fine 1st offence is £200, 2nd £2000, 3rd £20000, etc. and when you get to the point where people cannot pay (or their penalty would significantly impact other non-offenders) you trade money for prison sentences. There are probably far better ways to design such a system but I think there should be a faster escalation.
It's a bit like "you have been warned (£200), do not ignore the warning".