I hope you don’t mind me jumping in here Si but I have a bit of experience with these reversing cameras mind I must say not exactly that make.
When I started mucking about with NV my brother had the same idea as you and got one from the Bay. On arrival it immediately became clear it was not up to the job of a NV spotter. They are designed to operate over a very short distance and as such the field of view of the camera and NV capabilities were very poor.
Ian
this one isnt a reversing camera its a dash board camera with wide angle and a 1/4 chip for 16 quid it might be worth a shot