Using satnavs in major cities nowadays is the quickest way to getting a PCN, London being the worst, of course.
However, having said that, whilst the signs seem clear enough, there is a very short distance from turning in to assess where to go., 29 metres im fact, according to GSV. Not much time for a stranger to the city to move into the other lane. In my view the advance signs should be on Renshaw, and Lime Streets.