From the obvious land rover track on the other side, diagonally across the river.
It's mostly BB deep, or slightly over. I didn't even think about trying to ride it.
There's also another ford just round the bend to the left, by the rightmost tree, and a third further downstream.
The map shows the track sticking to the right bank in this area, but a landslip has taken it out so there's only a narrow path (on the left just above the gravelly landslip bit). It looked a bit precarious so I took the wet option. The Bing view shows it all (but probably doesn't work on a phone).