Cycled through from Stone today.
There is a new electronic gate with no pedestrian/cycle access at OS ref 766 141. On our way north it was open, presumably because an estate vehicle had just been through. On our back it was closed, so had to divert via the bridleway (Midshires Way) just to the north of it. I see from the map there's also a footpath to the south of it.
The bridleway is extremely bumpy, even on a Moulton.
Didn't have a problem wiggling the tandem through the Waddesdon gate at the top of Waddesdon Hill, but no way a trike would get through. Saw lots of walkers and cyclists. None of the estate staff challenged us, some even waved!