A test to see if you are ready is to take your hands off the controls at mid downwind. Are you steady at + - 50 feet of the correct altitude and does the nose stay steady, not pitching up and down at all with your hands off the wheel
When you are on the final approach at about 500 feet above ground is the airspeed + - 5 kts of the proper approach speed and again does the nose stay in a the correct descending attitude with your hands off the wheel, not appreciably rising or falling on it's own ?
Yes and No in that order (IMO).
So, I'm not ready for circuits. There's an obvious problem when you have to come to a forum to be told you're not ready for a particular stage in flight training. I have to say that this type of confusion was not something I bargained for when setting out on gaining a PPL. The only solution going forward is to gat familiar with one (maybe two) instructors. Failing that I will either invest my hard earned cash in another hobby or move school. I have no intention of continuing to waste my time or money.