The Saints official homepage says live video broadcast is available to all this evening, including UK. Saintsplayer is where it’s at.
https://www.southamptonfc.com/en/match/coventry-city-vs-southampton-english-football-league--championship-2023-12-13?utm_source=dotmailer&utm_medium=email&utm_campaign=3338318_PRE - Coventry (A) - 13%2F12%2F23&utm_content=Button - Watch Live (SP)&dm_i=2HKL,1ZJV2,2BPTKE,72P86,1