Thanks for the replies guys. Thanks for the doc links Marjon, thats really useful, as is the info about the manual on FullfatRR.
I've made a start on putting it back together today, hopefully I should get it ready to bleed tomorrow. The battery...
If you look on the fullfatrr forum (yes sorry about that) near the top for "wiki" you can download the workshop manual from a link on there. Sorry to hear about your friend.
One dodge is to use 4mm set screws nylock nuts and washers to replace the retaining pins (and yes it's what I did having tried other options, it works ok)