The Class 458/4 is the new version of the former Class 458/5 by British Rail. Today 458417 was hauled to Bournemouth by 56081 & 69008. Unfortunately I didn't see it however a few others did. Here's some videos. You can find more about them here: https://www.railforums.co.uk/threads/swr-class-458-to-be-retained.215775/page-51 Who else is looking forward to see the 458/4s in action?
Having travelled regularly on them as 458/0 and 458/5, I'm looking forward to seeing what they've done to them now.