hey peeps im an mot tester and can say i havent heard about this so isnt true, as said before hid lights are old hat, and any exhaust that make a sound louder than a standard system is an rfr. but there are alot more rules in force now, ill try and remember some of them

battery insecure
engine and gearbox mounts
any suspension dust cover split/missing
inner cv boots split/insecure
dash lights have to work
speedo has to work
engine management and airbag lights on
tow bar electrics have to work
all doors have to open and close from inside and out
fuel pipes are now testable

there are loads others i cant remember but vosa say its on a 2week bedding in period and all failures can also be advised if unsure, which gives testers time to get used to the new rules and system layout change

also found out if a coil spring is fractured at the top or bottom but is still safe is now just an advisory