Any expensive (£350+ rod), not made in the UK, rod, is more than likely to be built in Korea. Most brands use a Korean factory somewhere in the chain, if they don't have their own local manufacturing.
Without giving brand secrets away in the sea-angling sector, probably the most prestigious name in fly fishing makes most of their blanks in Korea now.
The funny thing is, there are not that many factories in the world that make fishing rods, so chances are, most brands are all using the same factories.
I do get why people are loyal to one country's brands, though, so I'm not knocking it at all. I quite like building model aircraft, I could easily use a Humbrol brush made in China, which I could buy for £2. Instead, all my brushes are French-made Raphael 8404, which are £20 each. Do they really make a difference, probably not, but I prefer to use them.