"If the lamps are not the ECE approved type you may also fail your MOT."

So pull the lights and fit your old units once a year for the MOT. I know a guy who MOT's every year with his "Check Engine" light on because his US made SUV is passing anti-freeze into the exhaust and killing his O² sensors. £50 extra at time of test takes care of the "problem" and is cheaper than fitting new O² sensors just for the test.