I find it hard to believe the updated Class 390 will stay on the shelf for long but as suggested above, an unbranded one will fine.
I grabbed the Pendolino before it was withdrawn and, while it's not a purchase I regret, it's not half as much fun to drive as the APT. That's IMO of course and it may be because WCML Trent Valley isn't the most thrilling route but just saying.