Hmmm, that is interesting. I might just reinstall mine!
Regarding MoT, they say that with HID lights you need high pressure washer jets and/or self levelling headlights/suspension. Surprised it passed with the HID kit to be honest but thats good to know you've ran them 2 years without being a distraction on the road.
I never got flashed either in the 6 months I ran them (only used the about 8 times as my Jeep wasn't used during Winter) but did worry...