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That exemption has been in for a while and is something my wife and I are beneficiaries of; we're in a support bubble with my wife's parents. It was introduced before the summer as far as I'm aware...
I guess it could potentially be linked to Boris having (another) kid but it's been a lifesaver for us. I'm stuck at this computer for at least 5 days out of 7 and my wife needs support in order to cope.
Boris conveniently exempts himself from the new Christmas rules
https://www.ft.com/content/290c234b-e8e3-4abb-9c71-26ada5a633d9