I believe the shots taken at around 0:30, titled Biggleswade, were actually taken at the old sheds, Langford, between Biggleswade and Arlesey. Spent my early trainspotting days there, 50 years ago now, seeing all of the Deltics pass by at one time or other. That bridge is on the Edworth Road and the footbridge just in sight is what we referred to as "The Meccano Bridge". Both replaced when electrification came to that section of the ECML. SO good to see the location again, now long since lost to housing. Thank you for posting this.