I believe Neil is asking which was to turn the torsion springs.
They need to be turned in the direction that tends to make the coils tighter, not looser. In general, I believe both the right and left have to be tightened by turning the winding mechanism upwards.
But Neil, if you have to ask, it is my strong suggestion that you have a door company or someone skilled in this adjustment do it for you. TORSION SPRINGS ARE DANGEROUS! One slip of the tightning bar and you can break a hand, jaw, or worse.
Please be careful!