I dont know many people on here who fish Blackrock, or the Severn at Bewdley.
I would give Mal Storey’s a call at Kiddy, they may have a better idea.
If you have never been there before, i would keep away from the rock itself as not only does it run fast and very, very deep in places, but the fish know there environment. they break for the over hanging submerged ledges and break 8lb line as though it were cotton. Over the rock, down stream, into the next meadow, its alot shallower and the pace drops off considerably. I would go with pellets banded and pellets in the feeder.
River should be up though due to the recent rain.