The site is easy to navigate, graphics and headings are clean and crisp. I would like some sort of link or explanation for the "WRAS Approved" graphic. Maybe if I lived in the UK I would understand it though. Also a link to PROTX might be good. Maybe they would agree to exchange links (I see you have some links on your "contact" page, maybe they would reciprocate).
I've been getting into
SEO and promotion lately, so here is what I noticed: You have a Google page rating of 4 which is pretty good. You might be able to improve that by changing your Page Titles. For example, the home page, "RSD Hygienics" might become "Bidets, loos, convert your toilet to funtion as a bidet-RSD Hygienics" Especially where key parts of your text appear to be graphics. Also, an "ALT" tag for your graphics would help. I couldn't find any keywords, descriptions or meta tags either, but maybe they're in the frames?
I go on about this because I think your site is very well done and simple, so I don't know what else to say!
If you'd like to take a look at (and offer suggestions on) my site that is going live soon, please feel free:
http://64.179.21.94
Best Wishes!