Like others, I wouldn't panic too much just yet.
However, I was slightly concerned that you stated that the website (which is currently down) only offered an email address for contacting the company. It's illegal for UK businesses to trade on the internet without providing a postal address. (That address though is often only on, say, a 'terms and conditions' page, so it doesn't always immediately leap out at site visitors).
However Essencia doesn't seem to be 'deliberately hidden' in the way that some 'iffy' websites are. The name and address of the guy who registered the site name are (as the law requires for businesses) easy to find:
http://webwhois.nic.uk/cgi-bin/whois.cgi?query =essencia.org.uk&WHOIS+Submit.x=0&WHOIS+Submit .y=0
David Thomas appears to live on a housing estate just outside Bridgend. The phone number (somewhat surprisingly) isn't ex-directory. BT directories lists K R H Thomas as the account holder at that address. The phone number is (01656) 647620.
So, if you experience difficulties, you know who to hassle! ;-)
Chris