Hi Thanks for your input. What i am currently doing is doing original pieces for each page that I would like to rank for. They are informative in terms of mattress buying advice, where to look for them, what to look out for etc. I am very tight when it come to any form of self promotion. each piece is 100% original and submitted on its own. No software and no spinning.
So for example I write a piece on what types of mattresses do what, where the best place to look for them is, what sort of signs to look for for defects etc. At the very end of the page I include a link to my page that is relevant to the content that I have written, purely as a suggestion that the particular page link may be of help to them. So whilst that link is to a sub domain I was just wondering if there should be other links to other pages or if that one sub domain link is best practice.
If I understand you correctly it may be ok to include a link to some other non promotional types of links like a post to sleep tips and probably not a good idea to include links to home for no specific reason other that link strength?