You maybe should inform the government of this.
Section 84 of the Road Traffic Regulation Act 1984.
Any speed limits below 30mph, other than 20mph limits or 20mph zones, require individual consent from the Secretary of State for Transport.
Unless an order has been made and the road is signed to the contrary, a 30mph speed limit applies where there is a system of street lighting furnished by means of
lamps placed not more than 200 yards apart.
Traffic authorities have a duty to erect and maintain prescribed speed limit signs on their roads in accordance with The Traffic Signs Regulations and General Directions 2016 as amended.
If traffic authorities wish to deviate from what is prescribed in signing regulations, they must first gain the authorisation of the Secretary of State for Transport.