Not that this will be much help but my 04 90 also pulls to the left under heavy braking and I put this down to suspension setup and camber.
My parents transit van and freelander, as well as my friends 06 L200 also do the same, but not as severe as the 90 does it. I just put it down to suspension, different dampening rates etc.
Obviously if you have a camber to the left, more weight should in effect push toward the front left making it 'dive' that way and pull - though I can't say I've ever only noticed the front left wheel locking up and this could be a separate problem. We ruled out tyres as the L200 has the equivalent size BF AT tyres (width and circumference) just on 17" wheels