For all those cheering on the sanctions (not yet applied, the committee didn't have that power) it is worth noting that Boris claims they were working outside their remit.
Since he made that claim BBC News (among others) have carried the story:
The committee said the initial proposed sanction was increased "in light of Mr Johnson's conduct" in recent days - including breaching confidentiality rules and "being complicit in the campaign of abuse and attempted intimidation of the committee".

Mr Johnson's statement was "completely unacceptable", they said.

Surely increasing the proposed sanction based on anything other than 'Partygate' and Boris comments at the dispatch box is also outside their remit. They seem to be proving Boris' point.