Wow this is old... but I have to reply! What size is the pond? In a pond setting where seasonal changes creates some natural (healthy) aggression in Goldfish... usually due to spawning, you have to have hiding places and room for the other - slower - fish to get out of the way. Plants and shade help with this, so be sure to have plenty. Also, many people believe fancy's are best suited indoors because they do tend to survive better away from harsh winter temperatures... however, you living in the UK, probably don't get really harsh winters like we do in much of the United States. So, I'd say you are safe!
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