You may, but many people just simply do not care where a product is made or what they are supporting. All they want is the cheapest price possible.

1-PD for example, he bought a chinese made decat from ebay (not an British company). The decat arrives and doesn't fit so he takes it his friend (we can assume is a british citizien?) who owns a local (british) engineering shop to have them modifity it to fit.

Now why didn't just he have his local engineering shop fabricate the whole decat oe purchase one from a british exhaust manufacturer? Most likely due to not wanting to pay the higher cost of having them fabricate the decat, so he bought the chiense made one.