does anyone know if haynes do a manual for the silverwing? or anything else similar?

Simple answer, no they don't.

If you hunt through the web, you can often find the official service manuals online somewhere.

They don't as far as know. But they've recently released one for the Burgman (all 250/400 models not the 650)
So maybe they might do a Silverwing and Tmax one soon?

You can buy official Honda manuals on-line in the US . They are for a slightly different model from the UK/Europe one but all the basics are the same. Honda only have manuals on-line to dealers in the UK AFAIK>