Welcome to WS!
Thanks for your post, always useful to hear from someone that knows the area.
The police have stated that all CCTV available to them has been reviewed, no sighting of NB leaving those exits apart from one (allotment lane exit I believe) which we are now finding out the caravan site here has CCTV in and/or around it but it is not in working order. Or it may be that the exit does not and they are requesting dashcam footage from the public.
The time frame is tricky, a witness seen NB at 9:10am on the upper field and after this no sightings.
Can I ask, are you aware of locked gates around this area and if so have any idea if these would be private land or council. I think it’s useful to know who, if anyone, had access to these locked gates.