Yellow box junction needed

Buses travelling southbound down Newington Causeway frequently can’t join the E&C roundabout because traffic moving eastwards towards new Kent Road is frequently blocking the junction during evening rush hour. Need a yellow box junction to prevent this and ensure the free flow of buses southbound. I know the E&C junction itself is out of scope but this is a very, very easy fix to slow running buses serving the rest of the route, which get bunched up on Newington Causeway waiting to travel south at the traffic lights opposite the Wetherspoons.