I did keep well to the starboard, probably about 2 boat widths from the bank and was on tickover just so I had a bit of steerage. The chap with whom there was nearly a collision was holding onto the moorings outside the sailing club HQ and let go just as my bows got abreast of him.
Point taken about the yellow boards. I probably could have stopped but how long would I have had to stem the current in reverse gear before they cleared a way through? Some time I suspect.