@Timee - hmmm, damn good question mate. Im pretty sure no, as Ive rebuilt that section at least 3 times and always followed the manual - but hey, anything is possible and Im willing to try anything at this stage!
Thanks for the interesting suggestion!
EDIT - dont have the car in work today, but can remember that the 22T gear is on the layshaft with the slipper assembly; and the 33t gear is on the other layshaft (the one with the belt going to the rear diff).
Not sure if anyone on here can confirm if thats right or wrong?