Hmm, no can do - car is not on wheels yet (single garage, no space, leaving wheels as late as poss). The 'box was professionally reconditioned, so I'm not expecting it to be an actual problem with that, I'm assuming it's me not getting the lever or pedal right.
Even when I first got the 'box and before I put it in the car, I was never able to put the lever into any gear - is that not normal?