Hi Pete
What are you being offered for £100/month?
Did they provide you with any action plan that they will follow so you are clear on what you are paying for?
With ALL MY RESPECT to your provider, if I were you I would do the following once the site is produced:
- Make sure the site has clean CSS
- Make sure title and alt tags are being used effectively for links and images throughout
- Check the header tags contain your keywords
- Place different title, description, keywords meta tags on each page
- Make sure you have effective inter-pages links
- Create a valid xml sitemap and submit it to major search engines - Google, Yahoo! and MSN provide you with tools to do so
- Set some sort of traffic stats (i.e. Analytics or Statcounter)
- Submit your site to local business directories
- Participate in online communities such as UK Graphic Design Forums for instance and use your keywords to link back to your site
Once all the above is in place, give it few months and then make your decision whether you really need to pay for further exposure.
Hope this makes sense.
~Peace~