I, too, was similarly bemused, jake.
The wording on Dangerous Driving in the Road Traffic Act is quite clear and it relates to the standard of driving, not to maintenance or alterations.
The report does say that the defendant �...was allegedly travelling at up to 60mph before losing control on a bend after passing two vehicles heading in the other direction" and if it is those actions that have attracted the charge then I understand. However, it seems that the prosecution is introducing the standard of maintenance as an aggravating feature and I cannot see how that can relate to the standard of driving at all.
We�ll have to wait and see.