RE: Order order order order order... LOL9 Aug 2021 23:49
Ultimately it is the Chair, The Speaker of the House of Commons, who controls the House and who speaks and when. Members have the right, when speaking, to be heard without unendurable background noise (deliberate or accidental) and the Chair will call for order if it appears there is an attempt to drown out a Member or when a number of Members are leaving the Chamber, or conversing loudly.
https://www.parliament.uk/about/how/role/customs/