How do I check the reliability and customer satisfaction of international online shopping websites ( australia & england ) :-/

Do a search for the link on Google. See if there are any consumer sites linking back. Check them out on www.planetfeedback.com as well.

Also see how long they are in business - do a whois query from www.netsol.com & that should tell you how ong that domain has been registered to that person / company.