Well the clutch return spring problem has been sorted...finally. Thanks again to all the helpful comments on the other thread.
In short, put the spring back on, and could not get any gears. Next, adjusted the adjusting bolt and put the spring back on. Getting good at this spring refit by now.
But now I had a fast idling engine. Go Figure. Following Incogneato's suggestion I took the spring off again, and put the accelerator cable between the slave cylinder and the spring...all good.
Running smoothly. The clutch pedal feels a bit different, but I could be comparing with the stiffness of the hilux clutch. Went for a short run for fuel and air, and all seemed good.
Next...find the oil leak. Took off the sump guard so I have access to the sump and will have a look after I clean things up a bit.