Handbook/ service book (it's one book) should be available from the Factory?
Richard Thorne had some in last year, around £19 I think (!).
If you get stuck I'll photocopy mine for you.
Enjoy the S1, they are just the dogs whatits Imho !

1969 4/4
1995 plus 8
1996 Plus 4 4seater
2002 Aero S1
2013 M3W
2014 Plus 8