what year did landrover go metric ???
Landrover started to go metric right at the end of S2a production with the wheel studs. The process was still incomplete even at the end of S3 production - I believe S3 still had a few BSF (as opposed to UNF) threads left to the end, including the wheel bearing nuts. My 110 still has some UNF.
The change from British Standard to Unified Standard threads started with late Series 1 production, I think the diesel engine was the first assembly to go all Unified.
Dave is correct about the grease packing - assemble wheel bearings packed in grease to provide initial lubrication. This supersedes the earlier provision of oil fillers on the drive flanges. If your drive flanges have these fillers you can fill the hub with oil - 1/3 pint (0.19l) instead of greasing them, but you must do one or the other - you cannot rely on the oil getting to the bearings before they are destroyed.
John

