A massive gray aream, but really, no. See the documents below, but this is from an official VOSA representative
"Currently DRLs are not inspected as part of the MOT and retro-fitting DRL will not result in a test failure regardless of their placement"
However, really, since these lights aren't E marked they aren't road legal, but that's going by the letter of the law 100% which nobody enforces, even bulbs have to be E marked to be road legal, so LED bulbs from hong kong would fall foul of this law even.
"E marked" rules are below for reference
However, Someone handily wrote a letter asking about the legality of retro-fitting DRL style lights, here is a helpful response from VOSA. this states DRL's are not part of the current MOT test, but simply have to comply with other road lighting rules.