sorry to be a pain, but am having a few problems with my freelander.It seems to be gobbling deisel and i wanted to start looking into why. I cannot find the air filter.
While changing the air filter you might consider changing the 'filter' in the crankcase ventilation valve / Depression Limiter valve.
Do a search on this site for these items.
Have you undone all the bolts, theres at least a couple on the back bulkhead side.