Thank you. I'm a day late and a dollar short.
They get on with testing straight after arrival at Old Oak Common depot it seems.
I think 345074 might be delivered soon as some indicated that one of the previous three attempts had 345074 as a possibility instead. Even if not so the first two were just over a month apart, so 345073 could have been expected about 20th September and so 345074 would be 23 October (next two weeks) !. That's a lot of guessing though.
345071 delivered 14/07/2026 Tuesday
345072 delivered 17/08/2026 Monday 3nd ? attempt
345073 delivered 06/11/2026 Tuesday 4th attempt