Pace
Some observations about your comments.
These are uncontrolled airfields.
Correct. We are discussing the application of the R of the A, either in a non-radio environment, or with AGCS or FIS.
It is mostly about how much traffic there is and pilot communication.
To some extent, yes, but also as above!
If I am flying into an airfield from the north onto a southerly runway and there is little or no traffic about will I add to my costs by needlessly flying into the overhead, do numerous 90 degree turns just to get back to a final position which I was almost on?
Probably not if you are aware of the position of other traffic - is there anything in the R of the A to preclude a straight-in approach?
Will I communicate with the one other aircraft in the circuit and the FIS and state my intentions and position for a straight in?
I am sure that you will.
If I am flying VFR and the cloudbase precludes an overhead join what will I do then??
Depending on the traffic situation, presumably either as above or otherwise complying with the R of the A to join the circuit, in this case inevitably at circuit height (including all turns to the left unless...etc).
There is not even anything wrong with a right or left based join or departure if your the only one in the sky or your in direct communication with the only other aircraft flying.
Sounds reasonable, but not actually what the R of the A require.
Cheers
2 s