When I began to learn SEO, I read everything I could find. As a result, I learned a lot of bad information. Since that time, I have tried to rebuild my SEO knowledge.

For the most part I rely on Matt Cutt's videos, his blog, and SEOmoz. In particular, I only trust a few individuals who have clearly demonstrated themselves as industry professionals, have solid knowledge and are consciously trying to share their experiences. On the one hand, that could limit me from learning new things in some cases, but since my time is limited it protects me from the seemingly endless pit of bad SEO information.

I would only provide one link on a given keyword per page. SEs will only evaluate the first link to a given URL on a page, and a selected keyword should always be linking to the same URL throughout your site.

So the specific answer I would offer is once per page that the keyword appears on. For example most sites have a "Home" link in their navigation bar. That link will appear on every page of their site and it works fine.

You can alter the keyword or phrase and provide links to other pages. You can send "cars" to one URL, sports cars to another and luxury cars to a third URL and so forth without any concern. You don't want your page to look like a collection of links. As long as you do it in a quality manner you should be fine.

First and foremost, ensure you are not using any blackhat techniques on your site's home page. I found a problem within 2 minutes on your site. It is highly likely Google noticed as well.

Your home page's header tag is not visible on the page. It is hidden behind the graphics at the top of your page.

<h1 class="HomeTitle">Chartered Accountants Swansea | Harris Bassett h1>

I would also suggest using your target phrase at least once on your page in content. You do use the words on the page, but not together as a single phrase.

Once making these changes, it may take a full month to see the changes in search results.

The resources it takes to improve your site are relatively low. Your site is not an e-commerce site. You don't accept online payments. It is a relatively simple site. With the proper knowledge, you can build it yourself. Alternatively, you can hire someone else to build the site for you.

Many companies offer to create basic word press sites for $500+. Personally, I don't like the quality of those sites at all. For between $1000 -$2000 you can build a very high quality, professional WP site including any extensions you need, a graphics layout, and everything you need to succeed from a SEO perspective. There are major corporations who spend hundreds of thousands of dollars to build their website. A small business should be able to afford a simple site as described.

With respect to the time, I noticed from your About page your company has at least 3 employees: Nick, David and Sharon. Is it possible each employee could write one helpful article each month? They could talk about a current situation they face, or a current hot topic in the industry. If one outstanding article can be written per month by each employee, your content will steadily grow over time. Additionally, you content may draw in new clients. The content will certainly offer new opportunities to rank for additional keywords.

Would the creation of a twitter account and feed on the homepage help with SEO to get us on the 1st page?

The creation of a twitter account in and of itself will not offer any tangible benefit. You need to actually use the account for it to have value. Tips, links to articles, helpful reminders, etc. can all make great tweets.

if you look at the other sites in the top 10 list they are very weak, I cant understand how my site has not overtaken them already.

As I shared, your site has at least two major problems with respect to ranking for the key term. You are using a black hat technique which alone can knock you off the first page. Additionally, you do not use the target phrase a single time in content. Both of these points are major SEO issues. At the very least, fix these two issues today.