What do you mean by roundels?
Do you mean smaller signs?
do they accept there are no signs on entry?
It depends whether you are willing to risk costs.
You could argue this. The law is that there are only three automatic speed limits in the UK. The first is 30 mph in a restricted zone signed by street lights, the second is 60 mph in a single carriageway without street lights and the third is 70 mph on a motorway. If they want to vary those limits then they need authority from the Department of Transport and they need to erect signs that amount to ‘adequate guidance’ under S85 Road Traffic Act.
However, 'adequate guidance' has been defined by the caselaw and it is not particularly defence friendly. If the painting on the ground was clear and unambiguous then you would be taking a risk by fighting this.
It is ultimately right to say though that only costs is being risked. If you are happy with that then you could fight this. The number of points you receive you would not increase as a result of a trial which was decided against you.
Can I clarify anything for you?
There is case law on what makes these things defective and it literally has to be such that you couldn't understand it was for you.
There is no real doubt that it was.