but not sure what the outcome of this was at the end.It was refused.
The adjudicator's reasoning was clear.
For vehicles turning left, reading, learning and inwardly digesting the signs' wording is impossible and advance warning is required.
But it's there and GSV from 6 months ago shows that it's clear and not obstructed by anything.
OP, IMO you would not succeed with any argument related to the signs and would need to look for technical/procedural arguments.