Paths and tracks lead down to a point midway between bench and weir that isn’t visible from riverpath. At this point on google maps there is a sandbank in the river – is it fordable here? By foot or quad bike maybe?
There is a great drone video (Daily Mail) here
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The stile (which is one of the locations Willow was found at) next to the bench is visible at the 0:38 mark. Then the drone flies partly over this area. The path and quad bike(?) tracks are visible. Just before the video leaves this area at 1:28 there is an area visible on the opposite bank which could lead up to a path or track.
I love to see some detail of this area. Is it possible to then head up to the church and Hall Lane, or even the other direction towards the 'Abandoned House' and then back up to Hall Lane and where the rad van was supposedly parked?