From the RAC.
Minimum speed limits
Minimum speed limits are rare in the UK, but they do exist in places where going too slowly can cause increased congestion or high risk of a crash, such as in tunnels.
They’re marked by a blue, circular sign containing the minimum speed limit, while the end of a minimum speed limit is signalled by the same sign with a red line through it.
Although there isn’t an official minimum speed limit on most motorways, travelling too slowly can be considered dangerous and you might attract the attention of the police.
In this case, you’d usually be let off after a verbal warning, but you could be prosecuted for careless driving.
From me.
Ok so you maybe can't drive at 50 coz the traffic cops are bored and you maybe can't drive at 50 coz you might inconvenience the lorries!!!
If you drive a lorry you definitely aren't supposed to drive in the outside lane.
Lorries are supposed to be regulated to 56 so any time they're overtaking its at a mile or two per hour faster than the other lorry. Therefore you are causing less inconvenience at 50 coz the lorries can pass you quicker???
How often do you see lorries pulled for overtaking in the outside lane?
And, to take it to extremes, lorries all inconvenience cars coz they all do max 56 on 60 and 70 mph roads.
F*****g can of worms this one. Love to see that argued through the courts.
Finally blame HSE (not that HSE!! the health and safety one)
Do you use your landy for work?
Does it have a coshh assesment detailing that ear protection must be worn at speeds of over 50mph. Oops, no that won't work, can't drive with both ears restricted (ie headphones etc coz you wont hear warning signals.
Hmm, no real point to this post, just the musings of a cynical mind.