I would go to court (MrT) and plead exceptional hardship if he were to loose his licence. Depending on exactly what, where & when the previous points were for he may be ok.
I understand the fine for failing to disclose the driver of a vehicle is up to £4000
If the vehicle has a tachograph and you cant produce the chart you are opening another can of worms.
Even if the vehicle does not have a tacho and you run a delivery business you may find yourself in trouble for failing to keep adequate records.