That's a very tidy video: Good composition, very nice!
However, I will pull you up on one thing you say in the video description: These carriages probably aren't for insertion into 390017 - 020, the numbers that are allocated and applied to the new Pendolino coaches when they are brought across to the UK from Italy are provisional only. It is more likely that the numbers carried by these coaches denote them as being the 17th, 18th, 19th and 20th pairs of new carriages to be delivered. For starters, it has been reported in the 11-coach Pendolino thread elsewhere on the forum that 390019 has already been lengthened to become 390119 prior to these carriages arriving in the UK.
The carriages are only fitted with the numbers appropriate to the set they are going to be inserted into after they have arrived at Longsight.