Turn images off and look at your site. Use alt attributes and a background color that is similar to your background image.
http://www.portersfuchsias.co.uk/Quality%20policy.htm
Avoid spaces in URLs; they make them ugly like the one above.
Now, maybe you're not responsible for the writing is ranted below, but it is still a problem that somebody should fix -- consider this advice to be directed at whoever did the writing.
Speaking about the above page, it seems laden with buzzwords. Rewrite it without using " Continual Improvement" as the subject of a sentence, and try to go the whole way using the words am, is, are, be, being, been, and become as sparingly as possible. This helps avoid phraseology like "Quality objectives." How are customers to know what the "ISO9001: 2000 standard" is? Explain the standard a bit better, if you can. "Fully integrated and updated quality management system (QMS)" is an example of meaningless BS. Replace it with something less obtuse. Instead of "which ensures that we have a fully integrated and updated quality management system," use something along the lines of "meaning that we do this, this, and that." Why do you give the initialism "(QMS)" if you don't use it anywhere else on the page? And use commas when commas should be used. There isn't a single comma on the page.
(end of discussion possibly directed at somebody else.)
Your staff page (http://www.portersfuchsias.co.uk/Staff.htm) has thumbnail images that are all twisted to the same dimensions, making them distorted and ugly-looking. You should not resize images using the height and width attributes (or CSS). The image file itself should be shrunken down, and possibly cropped a bit.
Then, clicking on a staff-member's image, I get a page with the most absurd and useless Java applet. I had to stop; put my coffee down; and experience a "WTF?" moment before continuing. Get rid of the superfluous java applet and use a regular jpeg image file.
The butterflies should go too. Good alt attributes are essential.
Visually, things look nice. However, I would keep the font size unset, at the user's default, for all paragraphical text.