As someone said above, when the de facto limit is already above 70 in many places, conditions allowing, then why raise it.
Driving above 70 is illegal, the fact that many do so does not mean I can do so without breaking the law. I'd like it raising so I can legally drive faster.
To believe that your MB is safe at 100mph should you have a blow out is at best a little deluded (and I mean no offence whatsoever).
I'm not guaranteeing that a blow-out at speed is safe, but in a car designed to handle well in all conditions and designed to be very safe gives a very good chance of remaining safe and stable if a tyre pops.
If an MB has a 4.3 litre engine, is it inherently safe at 120. Of course not...in a crash at that speed it will fall a part as much as any car...especially if its 13 years old.
I think you've got it completely wrong. I was using my Merc as an example, it's basically the same car that's designed to safely do speeds in excess of 155mph. Driving it at say 120 is well within it's safe design capabilities. Taking a car that is well maintained and not rusty, the age of it is frankly irrelevant.
The idea that the Corsa or other small car is nothing but a death trap is also less than true.
OK, take a German car (which are the best engineered cars available) which is designed to travel at say 160mph. Then take a Corsa that is just about capable of reaching 105mph.
Which is safer at 100mph? The car at a low percentage of it's maximum speed, or the car that's at the very limit?
Which is also safer at 70mph?
Could it not be the one that is designed to handle safely both in normal driving and if crashed at high speeds is safer?
The argument for increased speed limits will never get very far, because roads have so many different users. And because the average UK motorway driver is useless. You may be the best driver in the world...but in company of the useless you are no safer than anyone else.
I can't agree that the average motorway driver is useless - I'd agree if you said most of them. Driving standards are very poor.
If lane discipline was to significantly improve over night, then the argument might get somewhere. But it wont...so the limits will stay where they are. So, yes it would be nice to have a higher limit, but the arguments put forward so far will not carry mush water.