Yeah, because there's no difference between actual CCTV Footage with three Witnesses and just the 'Hearsay' of a Police Officer, right? I mean the Police would never lie or twist the truth a bit to get a Prosecution, right? They wouldn't want to trick you in to just 'Admitting' it to save them the hassle of having to prove it and all that Paperwork and stuff, right?
The Police officer's evidence is not hearsay. It's his direct evidence. Speeding offences require corroboration, the corroboration will either be the partial VASCAR recordings or a speed follow calculation which is a very simple distance/time calculation. If the OP had only been a small amount over the limit than the margin for error in the calculation could be argued as reasonable doubt.
He was doing between 30 and 50MPH over the limit, a follow on a police bike with a calibrated speedo is sufficient.
Your advice is poor, unfounded and based from seemingly no knowledge or experience. Nobody is saying "Don't bother with legal advice", but the fact of the matter is pleading Not Guilty to an offence which is so cut and dry will end up landing you a harsher sentence.
The question you have to ask is, despite the overwhelming evidence do you:
Risk it, plead not guilty, lose your mitigation from a guilty plea and end up with a significant ban and fine?
OR
Plead guilty, get your mitigation from such and get off lightly as the OP has done?
I would put money on doofer pussying out of a Not Guilty plea in the same set of circumstances, despite his assertions he would fight it till the end.
'Hello, DanielMMS? I'm at the Police Station and need Legal Representation immediately, can you help?'
'Yes, just admit everything and I'll be there shortly...'
If that's your Professional 'Legal Advice' no wonder you're advising so many Clients to plead guilty.
You have no idea how this Legal Advice thing works, do you? If the disclosure given to a legal representation is such that it's OBVIOUS a charge will be brought and a successful prosecution rendered then the legal representative will advise suitably. If admitting guilt, pleading guilty and cooperating will result in the best outcome then that will be the advice given. Or are you somehow advocating that all persons maintain a Not Guilty Plea at all times and go to trial ignoring the fact everyone knows the outcome before it even begins? I think you have watched too much TV.