If you are looking at a driving ban then it ‘might’ be worth bothering as that can have a big cost impact.
Basically the solicitor looks at every minute detail of process and tries to find something wrong. They then argue that that one mistake makes the case unsafe.
One example I know of involved a policeman on motorbike who pulled over a ‘star’ for speeding and suspected drink/drugs. ‘Star’ was bang to rights guilty on speeding, border line drunk and very squiffy eyed but the policeman didn’t have a drugs kit to test.
It went to court and the policeman was called as a witness. A little nervous about appearing in front of the notorious solicitor he chewed some menthol gum to keep his mouth from drying up.
The solicitor spotted him chewing and asked if he was being contemptuous of the court by eating while giving evidence. Policemen panicked and said no. Solicitor asked what he had in his mouth. Policemen said it was medical. Solicitor asked exactly what it was and the policeman admitted it was chewing gum.
Solicitor said that the policeman had lied under oath in court and could not be considered reliable so the case had to be dismissed.
It was.