What they said - DON'T DRIVE IT like it is. As suggested, do the 1 wheel up test...
https://www.landyzone.co.uk/land-rover/tests-new-freelander-owners-should-do-on-their-car.312863/
The VCU is almost definitely pants, if it is....
Take the prop shaft & VCU off - unbolt the front prop shaft from the front diff (IRD) and the back prop from the rear diff - then undo the 4 bolts supporting the VCU in the middle of them - take the props & VCU off as a single unit. Its an easy job if you have a bit of clearance under the car - eg I drive the car up on blocks on 1 side. Be careful though because the pieces are very heavy and support the props as you remove them so they don't over extend (bend). A good tip for the last bit - ie removing and lowering the VCU is to support it on a trolley jack before undoing the bolts and lowering if on the jack. Another tip is to undo the lower bolts on the props and then push the car along a bit to turn the props and rotate the top bolts to the bottom.
You can then drive the car 2WD - but you should notify your insurance company.
Then renew the oil in the IRD. If it comes out very grey in colour, be careful about putting it back to 4WD without replacing it with a recon unit as it may be weakened.
To go back 4WD, replace the VCU with a new or good recon one - Bell Engineering are a good one. Good idea to replace the carrier bearings while you're at it. Might also be a good idea to replace the front mount for the rear diff as well as they do wear out and that may have been hastened by your VCU issues.
Good luck.
