what are you hoping the out come of this will be
Did they inform you before the 27th that you were not insured?
You will need to pay the impound fees and have insurance to drive the vehicle away from the pound.
However, you could try to recover from your insurance company. The reality is that it might be a struggle as their negligence is only established if the verbal conversation that you had with them can be established. Verbal conversations are always difficult to prove.
There may be a recording though. They do record conversations sometimes.
Also, it might well be that they settle to avoid the manpower hours of having to go to court.
You can also complain to the Ombudsman.
The ombudsman is a slow process.
The small claims court is much faster.
Can I clarify anything for you?