China/Hong Kong. Maybe Japan too.
Oh, direct from manufacturer? I bet there's a world of stuff on AliX. Best I don't look.
No, usually just online stores. China for the bulk of it, Japan for the rarer stuff. Still a few UK based shops doing well, Modelsport being the "biggest", oh, and Tony's Tamiya Parts on eBay, Tony is awesome for just about everything.
There's loads of online UK modelshops.
I prefer UK stock as don't want to wait around or pay duty.
U can even filter by UK on ebay...
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China/Hong Kong.
Maybe Japan too.