I have descended the road side of Bignor twice, having taken off-road versions from the south (Madehurst) on my race bike and southwest (Stane Street) on my Audax bike. The turf gave me a smoother ride than the tarmac. But for risk management reasons I will be manning a checkpoint at the top to point out the bleeding obvious - take huge care on the descent, especially if it is wet. I did one of Andy Corless's rides a couple of weeks after riding up to Bignor, and that steep section would not be out of place in the Lake District. But rides should be audacious. And on 16th November there should be (in these globally warmed days) a reasonable amount of autumn colour remaining.
There's also the hidden treasure of Whitmoor Vale, the tour of Black Down with the window onto the world, the back side of Petworth Park and its great wall and the abandon-all-hope-ye-who-enter-here section between Stoner Hill and Newton Valence to explore as well.