Some early '60s observations/questions?

1) When were Northwood Hills reversers done away with? Did they ever use A stock when it was first introduced? Where did these trains turn back at? Was there a siding north of Northwood Hills for this purpose? This would have been a challenge when this part of the Met was rebuilt with 4 tracks.
2) Did the Uxbridge line wait until A-62 stock came on board, or were some A-60s used on it, say during the peaks, in the "beginning"?
3) In the Winter 1961 Underground Guide, one train left Uxbridge around 0530 for Aldgate. This was the only ex-Uxbridge offering to run as far as the city at this early hour. When it reached Aldgate, did it form a Circle Line train? This would be obvious, esp since both the Circle and Uxbridge lines used COP stock in this era.
4) On Sundays, an early am Uxbridge departure only went as far as Rayners Lane. If it returned to Uxbridge, where did it reverse? Could this have possibly been one of those staff trains that would serve the Uxbridge branch and head into town to form a Circle train?
5) I noticed that peak-hour services between the City and the suburbs started earlier and ended later than similar services during the later '60s and '70s. For example, the first train leaving Uxbridge for the City at the start of the PM peak left there around 1440.
6) I even noticed some ex-Uxbridge trains reversing at Moorgate and Liverpool Street instead of Aldgate.
7) I remember someone stating that peak-hour services in the early '60s were much denser than they would be later. My guess is that with the wider variety of stock available in those days (the beginnings of A stock and the latter days of F, COP, and T stock), such a peak-hour offering could be supported.