The politician who got this section slipped into the law, Judith Tizzard (Labour party MP), did so, right before an election and right before the end of her career. She retired.

Undoubtedly because it would have been the end of her political career in another way, if she was not retiring. Scrap that, they picked someone on the way out to slip this in for them, it's an excellent way to find a fall guy, someone who won't be even be around to cop the backlash. The amendment was also made when it was clear Labour would not be getting re-elected. A party on it's way out so the new government could dodge some flak, if they had to can the legislation they can claim it's not their mess, and they get the brownie points for appearing to respond to the public backlash.