Dredged last week, so the keel-grabbing mud lump has gone. Should be a straight channel parallel to the pier now, but I haven't seen it at low water yet - pic to follow when I manage it.
We usually arrive and leave at HW so it's never been an issue to us. However, next year we'd like to have a go at Sharpness, so it's certainly useful to know. Can't see us visiting sunny Portishead until next year now sadly - since I'm a complete coward and a definite fair-weather sailor.