. . . my Bernina 800DL was made by Juki and is identical to MO-214D . . .
Yes, lots if Bernina machines were designed and produced made at Juki Factories including the Bernina 1150MDA (excellent, high performace machine with a top mounted knife) which is pretty much the same as the Juki MO-734DE. One difference is the additional micro tension adjustment feature on the 1150 MDA and another is the looper threading on the 734DE. In essence the same machine but the Bernina was sold at an inflated price.
From what I remember, around 2008-2010 the Bernina contract with Juki ended and the production of Bernina overlockers was moved to other factories but it unclear where.
There's a general commentary (+ echo chambers??) on the Internet that there are only 3 or 4 factories that manufacture overlockers but it's difficult to fact check whether that's true and which Companies own them.
Bernina only publish that most of their sewing machines are made in the Bernina Factory in Thailand but they haven't said where their overlockers are made.
It's also unclear where Babylock have their overlockers made.
Not all the current domestic Juki models are available in all Countries including the UK. I think that's a pity because I really rate Juki machines for performance/value for money compared with like for like models sold by other brands.