Thanks everyone, I will be doing this job when I have some time off work in the next coup[le of weeks, but really appreciate your replys.

Thanks Hippo, thats really helpful. I will do it tomorrow. Phil

On my TD4 Freelander I have found the plug that you can remove to add some oil to the differential, but how do I remove it please. Is it a bolt or some other type of fitting and what tool would i need to use? Sounds a bit stupid, but I cant seem to see it clearly under the TD4. I have a...