Thanks to all those who have made kind comments on this thread. It really does encourage me to say a bit more.
After the strip down, the first job was to get the lump to ProwlerZ1
this is when having a big lad about the house is useful - it went in the boot no problem
Within minutes of arriving Martin had set to work and had the outer cases off for me to take back for polishing by Mikey
Shortly afterwards, I got the news following the full strip down... the following was the list of parts needed
Cam shell bearings x16 13034-030
Idler wheels x2 12057-002
Top idler wheel x1 12057-001
Cam chain x1 21070-003
Piston circlips x8 92036-021
Inlet valves x4 12004-012
Gasket set full vesrah prefared
Eng oil seal kit
Top idler rubbers x2 92075-119
Top idler rubbers x2 92075-120
Middle idler rubber x4 92075-232
Bottom guide rubbers x2 92075-123
Slipper blade x1 12053-019
Center guide roller x1 12055-002
Tensioner wheel x1 12048-001
Cam end eye rubbers x4 92066-017
Breather /sump o ring x2 92055-052
Filler cap o ring x1 92055-049
Drain plug o ring x1 670b1508
Filter drain o ring x1 670b1505
Filter bolt o ring x1 670b2016
Oil pressure housing o rings x2 670b2018
Oil pressure take off o ring x1 670b2015
Some of these are eye wateringly expensive - but not as costly as a breakdown on an Autobahn...
To cap it all I then needed a cold start tube
Thanks to all who have helped me through the wanted section on this site...
Over the next few days I will put up some more pics as I try and get the thread into real time.