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She added: "So I have no idea if there are other versions of the card on sale in other countries, or even here in the UK. "It is very difficult to know how long the designs have been on Temu and how many have sold exactly. "They're cards that sell well for me, so potentially I have missed out on a lot of money. "It's certainly cost me time, where I could be focusing on things that are a lot more important to my business, because it takes a lot of time to solve the problem." Cardiff University economist Dr Robert Bowen said businesses were "losing millions of pounds" over issues like this. "Certainly small businesses face more challenges with this, in terms of copying designs, because they have a lot less resources, less staff, less money to be able to put into processes that can protect what is happening."