rights of way within the circuit

[foxmoth]

Same applies - the base leg joiner should not, in my opinion, be joining on base leg!

Nothing wrong with thatprovided you give way to those already in the circuit, if you can hear where the others are and then get visual then no problem if you slot in properly.

Whilst performing an overhead join are you to give way to traffic already in the circuit?

IMHO that is one of the points with a SOJ - it gives plenty of opportunity to establish where the other circuit traffic is and position yourself to fit in.