I saw 802201 at Leeds on Monday night (
https://flic.kr/p/T6PxZY) whilst on a test run from Neville Hill to Crewe via Huddersfield and Manchester and then filmed it passing Huddersfield.
If LNER were using the units to test, I would've thought they would have been testing them out between Leeds and Huddersfield since Azumas will be operating on that route but the TPE 802 didn't stop there so presumably they're just being based there for the time being for their tests. It was also crewed by Hitachi personnel.
Another interesting thing to note is that the rear carriage is missing seats completely