The Brunel Bicentenary Special with 6024 King Edward I - 5th July 2006

This railtour started in London Paddington and ran to Bristol and return. Steam hauled from London to Bristol, one way.
The video is taken at Swindon.
This video was originally filmed on a Sony MiniDV DCR-TRV17E.

[@SimonTog]

Nice catch :)