Car insurance advisers that quote incorrect law! For example, I was stopped for having no insurance because the car didn't belong to me and it triggered ANPR - hence the stop. I gave them my car's insurance details which states I'm covered Third Party only for any vehicle not belonging or hired to me, which this car was.
After satisfying the law and allowed on my way, I got concerned about possible future action and called my insurers (KwikFit) to confirm I was indeed insured to drive that car later that evening - to which they said
I wasn't covered by my policy if the car wasn't already insured by the owner. This made me feel quick sick with fear - what if I'd hit and hurt someone?!??! - so I stayed on the phone demanding they check because they were contradicting two experienced Traffic Officers (who accepted my insurance was valid for that car and let me on my way) and my own beliefs I've held for decades.
KwikFit were adamant I wasn't insured and both advisors and their supervisor assured me they were correct, but eventually decided to check with
their legal team who agreed with my advisor that I was only insured to drive the car if it was already insured by the owner!!!!!
I was literally going mad with worry because I needed to use that car that evening to return it and feared for my freedom if I used it illegally. Eventually, KwikFit changed their mind and confirmed I was indeed covered and offered me £5 compensation for causing me undue stress, wasting hours of my time etc etc. Needless to say I didn't renew with them.