Were you speeding?
No. That is nonsense. That never even has been the case even in the days before GATSOs.
That misconception comes from a case called Gray which says that the opinion of two officers that a vehicle was travelling at speed is sufficient to form a conviction even where there was no evidence from a device.
They are perfectly entitled, and it is better evidence, to rely on the prior opinion of one officer supported by the reading of a laser gun.
Don't take advice from these sources. It is all very well for them to give you this false hope and then you end up paying costs and they are nowhere to be seen.
Can I clarify anything for you?