There are traders on here who sell HIDs that are direct swap that will pass MOT. I know KR is one of them for sure.
Most HID bulbs colourshift and lose intensity over the years.
Best to remove the HID bulb and check what connector base it has, should be a D2S. You can get new D2S bulbs like the Philips 85122 or 85122+ which doesn't colourshift for $90 a pair. They're used by most OEMs and they're 4300k giving you the strongest output.