LED's with warm white instead of common ice white. Change then bulbs back to halogen for MOT and put LED back once you have the pass. Having said that, LED's are no longer illegal and the MOT station can't tell if the LED wasn't fitted by one of the manufacturer's garage as part of an upgrade so they can't fail the MOT as long the beams are aligned properly. The issue with cheap LED bulbs is that they are not complying with CE/EU rules nor BS standards and you will see them not having a flat beam rising slightly to the left or being perfectly flat. As long they comply with BS and EU norms you will be fine. As reference, LED called ice white will be the ones with Kelvin of 5,000k and above. The ones you want will be with 3,500 to 4,000K which are of a warmer colour. https://richbrilliantwilling.com/blogs/light-reading/7988231-understanding-color-temperature-of-led-lighting