30 mph over the posted limit and a ban is considered ,this is direct from the clerk of the court when I got summoned for 77 in 40
I got 6 points and £270 fine
I got done for 74 in a 40, £60 fine & 3 points.
Then got done again about 5 years later, travelling a bit slower..........in exactly the same spot.
Same fine and points again, but the older points didn't matter by then.
The only two times i've ever been stopped in 27 years riding!
It's the only bit of road, on the way home from work, where i simply refuse to go over 38mph now, 'cos the police tend to look hidden amongst a line of trees until it's too late to slow down, they've already clocked you by then.