Overdue thanks are due to Bell Engineering run by Austen. I was recommended to them some time ago by the Forum when I was getting rear differential noise on my i6. I contacted Austen who was even more helpful than expected and ended up buying a re-furbished and uprated rear diff. Along with this came excellent advice for my non-Freelander-savvy mechanic who then completed the job superbly. Warmest thanks to all who helped.