The boat manual is on the polar ribs website as stated in the last post.
I have both the engine and sterndrive manuals but both are only in hard copy.
For engine spares you can't beat Mermaid so go straight to them http://www.mermaid-marine.co.uk/
For sterndrive parts, the only UK supplier is lancing marine but they are very expensive and I haven't found them to be very helpful at all.
I order my spares from the USA - this guy firstname.lastname@example.org
has an ebay shop and I've got parts from him before. See the thread about outdrive problems on Pacific 22 on ribnet.
You will get loads of info from reading the ribnet threads.