I had an interesting chat with a traffic-cop earlier who may be interested in buying a 101 - but that's an aside...
We somehow got to mulling over the strategy tried in a small Dutch village last year - some may remember that they removed all of the road signs and had no direct 'right of way'. The effect was a reduction in speed as drivers were generally far more cautious.
So, as these strange conversations go, it was muted that one strategy for the UK may be to have no speed limits - at all. However a caveat to this would have to be much harsher penalties if an accident was caused due to inappropriate or unsafe driving. In other words, an accident caused by a driver doing 20mph in the p*ssing rain outside a school would not currently be thought of as an offence - however it could potentially be a dangerous thing to do... Similarly it may not be at all dangerous to drive at 120mph on an empty motorway in the middle of the night.
The conversation didn't really go anywhere further, but it did leave me thinking.
Martyn