The speed limit in this country is massively outdated, it was put place when 70 mph was a fast speed for a car, and had crap breaks, crap steering etc...
Personally I find people driving along at 70mph more of a hazard then people driving about 85mph, its not the speed that kills its the drivers not paying attention, playing on their phones, drunk or whatever...
You should try going down the M6 toll road at 70mph, that road I swear is built for 100+ speeds.....I love going down it