Thank you so much (and for pointing out it was TWO MINUTES 59 seconds, not 3 min 59 - don't know where I got that from).
You're right, they'll have all the driver's movements on camera, including driving to the adjacent car park (the entrance is visible in some of the ANPR images).
I'll share my full appeal here next, and then let you know what I hear from IAS.
Thank you again!