This research was funded by an Engineering and Physical Sciences Research Council Prosperity Partnership (grant number EP/T005327/1), which is a collaboration between Jaguar Land Rover, Siemens Digital Industries Software, the University of Bath and the University of Oxford. Due to confidentiality agreements with research collaborators, the optical engine data can only by made available to bona fide researchers subject to a non-disclosure agreement. Please contact ben.williams@eng.ox.ac.uk if you would like to acess the data.