Hi Josie,
As others have said, its very difficult to find components manufactured in the UK, but its very posible to manufacture a completed product with everything sourced in and from the UK, and its something i have always Believed in since i started producing Amplifiers over 20 years ago now. Cost play's a big part in being able to make products competetive, however; that has never bothered me, for me the finnished product costs what it does, because of what's gone into making it, and the ethics behind the whole process.
I hope this helps.
A...