I’ve gone straight over down Abbey Brook in the (distant) past, which was pretty tight rutted singletrack. Good adventure riding, but not a lot of flow. I heard a rumour it had been flattened into a quad bike track for shooting access by the landowner, haven’t been back since.
As per tuboflard, once you’re on the slab track across the top, there’s a few potential variation’s available.
I would say that anything off the slabs other than down to Whinstone Lee Tor is midsummer bone dry riding only, to avoid knackering the peat, though.