Hi there, Don't panic! Try EBAY heading advert is a little green box (MOBILE LANDROVER SERVICES)   Dudley, West Midlands. My Rover 45 1.8 same engine same problem. He fixed it (a trained Rover Mechanic) now has his own business at a far less cost and Rover parts.
Get in touch with him. Hope this helps
                
 colinl
                
 February 2009