I havn't been down the Withy beds for years,so over the next week or so,I'll go down and have a recce,and let you know the lie of the land as 'twere.
When you walk into St Mark's Close,go past the entrance to the reserve(the old tip entrance),over the bridge which crosses Duck Brook.
Turn immediately right down the footpath (before you go into the housing estate) and carry on until you get to a flat wooden bridge on your right(150 yards or so).
Stay on the path,don't go over the wooden bridge.
Immediately after the bridge is the area they dumped in.
Beyond that is the area that is still wet,with bullrushes and kingcups.This area will be on your right as you curve round to the right and onto the river bank,where there might still be a spiked fence.
If you turn left onto the river bank,this will eventually lead you to the back of the flats in Elm Green Close.
There is a small bridge just before you reach the Ketch campsite,but I don't know of any other bridge.
It must be 20 years since I walked along there,mainly because the banks had fallen away,so I'd be interested to know if any remedial work has been done,since it is part of the Severn Way.