The word of an officer in court would be enough to convict
This seems bizarre. Plenty of cases where people got off because the radar gun or camera hadn’t been calibrated and checked in accordance with the rules, yet somehow the word of two police is sufficient?
Regardless, OP you’re a numpty for speeding regardless of the time or type of road you were on. Maintaining an indicated 35 in front of them wasn’t big or clever. Take it like a man
There used to be cases where people got off on technicalities with radar guns. They are now laser, with home office type approval. Meaning if you want to contest it on a technicality you pay for experts.
It’s also worth remembering that technically before an officer uses equipment to check your speed they should have formed prior opinion that the suspect was speeding, the clever kit is only there to corroborate the officers prior opinion