EICR - advised by inspector to replace distribution board

Maintenance

At a recent inspection of the electrical system for the EICR, the inspector noted: Lack of fire rating to the distribution board - Listed as unsatisfactory Code C2. No other issues reported.

The property has a modern style RCD consumer unit, mounted direct to the wall with no wooden board, it is around 12 years old. I am aware that there are some more recent regulations in place now, but understood that they do not apply retrospectively, so I am surprised that it requires replacing. Most properties over 10 years old would have similar units installed and so this is likely to be a common problem.

I have been quoted close to £1000 to replace the existing board. Of course I am happy to replace if it is necessary.

Is this a C2 fail or should it be just a recommendation?
It necessary to replace the whole board?
Is it possible to use a new casing, using back the existing RCDs to reduce expense and solve the issue?