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The main reason for length is because Mk1s were generally a lot shorter, being between 17m and 19m long. Compare that to a modern intercity train which is usually between 23m and 26m. For example, an 11 coach 390 is 26m longer than a 14 coach set of Mk1s, and a 9 coach 80x is only 4m shorter.
The Flowing Silk livery was temporary, the trains needed repainting as part of maintenance and since the franchise was up for renewal a base white scheme was chosen. Virgin then added the red flowing silk at the ends so their identity remains but could be easily removed should they lose the...
I don’t think they ever did, they simply remained in Connex livery. From pictures it seems they transferred still in Connex livery before being reverted to NSE livery by WAGN
They’re also used on TransPennine’s Mk5A sets, and will be used on their 397s too, and at least according to artist impressions (which aren’t always accurate) the LNR 730s will also have them for first class
Closest thing I can think it would be is one of TransPennine Express’s Class 802 units out on test on the line, which all but one are currently in a plain grey livery. They have 5 carriages, not 7, however