This is a route I rode and then noticed that other DV members were doing the identical ride a few days later!
To me, it is simply Forest Green and beyond, to some quiet lanes. The return leg goes up Leith Hill and down Coldharbour to Dorking. There is a fair amount of climbing to do.
At 44 miles (70km) I personally wouldn’t stop for coffee and cake but you may be drawn to the Butchers Hall Farm Shop at Forest Green.