I'm probably a bit late to the party on this and bet its old news but TD6 manual is available here (along with many other LR products)

Its not topix but at least its a start.

No TDV8 or 405s tho i'm afraid.

http://www.landroverweb.com/landrover/pdf-land-rover-manuals/ 405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown