I know where you’re coming from, the 50mph starts incredibly far from the Ashcombe/Kingston roundabout.
But ignoring it leads to tickets ... in the last year the speed trap van visits that spot frequently, giving easy pickings on hundreds of drivers.
Even then, it’s not a certainty - more than 10,000 drivers are currently permitted to drive on 12 or more points, claiming Exceptional Hardship e.g. they say they’d lose their job or livelihood.
https://www.bbc.co.uk/news/uk-england-40862975