French legal advice please

A friend was stopped and fined €135 and had his licence confiscated for three months. He was apparently doing 145kmh in a 90 Kmh zone.
Roll on 3 weeks and the French authorities have written to him at home in the UK & insisted that he has a medical examination by one of a panel of approved doctors in the Jura department (where the offence took place) before his licence is returned. There is no option to have a UK medic complete the questionnaire
1. What are the implications of not replying & not going to France to see a doctor? (He could apply to DVLA for a replacement licence)
2. Is it worth arguing with the French judiciary over inconsistencies in the paperwork - fined for 145, paperwork from gendarme says 143, paperwork from court says 135?
3. Paperwork now received from the court says 4 month ban, not 3 months as advised by gendarme. Should this be challenged?

Friend is a classic sports car racer, & FWIW was taking part in a competition accompanied by the Garde Nationale (?) - high level motor cycle police who eased their passage on non-competitive sections often at speeds over the limit.

Finally, sensible answers only would be appreciated. My pal knows he was in the wrong, but could do without the hassle of taking time out to visit a deserted area of rural France (I may take time off to drive him) just to pay €35 for a doc to complete a multiple choice double sided A4 multiple choice Q & A sheet.

Let the above be a cautionary tale to the many PHers heading to France this summer.

Thanks for your help