Request Unlock since the nearby UR is either saying Trinity Square is closed or Seething Lane is now one way. Either way I need the roads unlocked to fix this. 
I’ve unlocked the two segments of Seething Ln and Trinity Sq between Seething Ln and Byward St.
CoL road closures website says the junction of Trinity Sq and Byward St was due to reopen on 29th April so the previous closure here probably expired at 0500 on the 29th. It was still closed on Saturday when I went by, so perhaps reopening tomorrow morning. I’ll leave it to you whether to add another closure until CoL or URs confirm it’s reopened.