Like Simon I pretty much stick to 30, 40, and 50 zones, national speed limits are 'make progress' roads.
Around here all the side roads in residential areas are now 20mph. It just isn't worth speeding in built up areas. If you hit a kid, or anyone for that matter, bikes are really unforgiving to pedestrians, and above 30 you stand a good chance of killing them. Even if you 'clip' a pedestrian, cyclist, car door you'll be then out of control. Then its unpredictable where you and 200kg of metal travelling at over 30 go. And we all know who gets the blame when a bikers involved!!
If your caught speeding in residential areas, its open and shut, there's no excuse! Like I said, it just ain't worth it.
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