In England you have to drive no faster than 30mph through residential areas. I always try and stick to that - I think its frustratingly slow but as a rule I think someone is about 50% (or is it 80%) more likely to survive being hit at 30mph than 40mph. Maybe. Its something rather large though. I think its worth it for that.

I was reading an article in new Scientist a few weeks ago about how scientists are trying to develop new engines with the ability to have optimum economy with fuel at higher speeds - around 70mph so less fuel is wasted by people speeding.

I think British people do go very fast. I go fast sometimes, not always..I try and go carefully but on my way into work I generally go no slower than 45/50mph through twisty tiny country lanes. 60/70mph on the straight bits. I need to leave the house earlier.