Re: what other modifications?
Here is the handbook that VOSA are sending to the testers
Go to section 1.7
Vehicles equipped with High Intensity Discharge (HID) or LED dipped beam headlamps may be fitted with headlamp washers and a suspension or headlamp self levelling system.
Where such systems are fitted, they must work; however, it is accepted that it may not be possible to readily determine the functioning of self levelling systems. In such
It would appear that the aftermarket systems have a get out of jail free card, yet any car with defective OEM washing or levelling systems will fail the test
Its a shame, but VOSA appear to have missed the point
Having said that, aftermarket systems are still illegal