I'm sure your site will be a help to loads of people - however if i could make a few suggestions (i run my own website - although i do not sell anything):
1. Shipping costs: do you offer shipping? i couldn't see this anywhere on your site, this might be helpful when it comes to people wanting to order
2. Images: i realize your site is brand new, but it would help with people wanting to purchase if they can see pictures of what they'll get along with as much info as possible
3. Payment methods: again i realize your site is new but i don't see any payment methods built in to the site. A good start would be to introduce paypal payments to your site - this offers the buyers standard buyer protection/peace of mind should anything go wrong.
4. Contact info - although you have a contact form, a phone number and registered business address would be good. Speaking from someone who orders online a lot, when handing over money i like to know that if i have a problem the company/person i purchased from is available on the end of a phone - call me impatient, but i hate waiting for emails to be answered, if i need a solution to a problem/query i am the sort of person who likes answers immediately, especially when ive handed my money
5. Information, Information, Information: this is me being picky - but if i was going to spend £40,£50,£60+ the first thing i look for is how long the website has been going, how often it's updated etc - some news articles on the homepage and an updated about us page are a good place to start - it's all about first impressions and straight off the bat your site is in the 'start up' stage which may put potential buyers off.