Chris - there is a Haynes manual available for the 116. Keep an eye out on Ebay UK for them. They turn up fairly regularly.
e.g.
ALFA ROMEO ALFETTA, 1973-1981, HAYNES WORKSHOP MANUAL on eBay, also Alfa Romeo Workshop Manuals, Alfa Romeo, Car Manuals Literature, Cars, Parts Vehicles (end time 05-Apr-08 00:05:46 BST)
As for the 105, the original workshop manuals are available but I find it very hard to follow, and it is primarily for the original stepfront manuals. I use a combination of the Alfetta Haynes manual for the engine and an Autobooks manual which is like a Haynes guide. I also managed to get an official parts book which is great as it has exploded diagrams of everything with part numbers - it's in Italian though!
