Your site does seem to take a long time to load. Even longer than I would expect the ~150kb size of the home page to take. I wonder, if it's due to the Google Analytics? I've never bothered with it myself.

I suppose you do most of your business in Europe. I did a search for DVD replication on Google and didn't see your URL in the first 50 results. I did see other UK businesses.

Since you say that traffic is the same, but sales are a mere fraction of what they were, something is chasing the potential buyers away. You didn't say what your big seller is. In other words, were most of your orders for some particular product or service?

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DrTandem's San Diego Web Page Design, drtandem.com