part Indian owned, but still made in the UK. They also own the company that makes the cabinets for quite a few UK speaker companies. AVI use Spendor for their cabinets, buy drivers from Indonesia and, I assume, buy in amps for their smaller speakers. Musical Fidelity are made either in China or Taiwan, they haven't manufactured in the UK for years. Exposure are owned by a Malaysian company, but I don't know where they're made. Quad are part of IAG, as are Wharfedale, Mission and Castle Acoustics which are all made in China. Exposure are Malaysian owned, but don't know where they are made. Most Arcam stuff is made in China, as it the case for Creek and Epos.
Cyrus are firmly British. Naim are French owned but the factory remains in Salisbury. Their Nait series uses circuit boards from China, but still assembled in Salisbury.