Unlucky mate.
As far as I'm concerned, our speed limits are unjust anyway and so you just have to be aware of your surroundings if you want to put your foot down. For example, I regularly do 40-50 on 30 roads and 100+ on motorways and haven't got a single fine... ever. There's no point in learning to drive if you don't intend to have some fun.
On the other hand, if you were drunk then you just have to pay up because none of the above applies.