Taking a step back to describe the scenario.
Firstly, all of the comments are good and certainly provide both food for thought and options; many thanks.
The original enquiry came from a friend who advised the 'client' worked in an office and occasionally experienced seizures, exacerbated by the work-place environment (office heat). So the firm gave her a nice cool office of her own which eased the occurrences but now her work-place colleagues are not readily aware if and when she takes a seizure.
My immediate response was that the company still has a duty of care towards all its employees and if the seizure is liable to cause an injury, or worse, then she should not be permitted to work unaccompanied. My friend is giving this some consideration !
For a previous case-client I built a pram-brake system which would automatically apply the brakes if she experienced a seizure, fell and released the pram. Having been asked by my friend on ideas for his work-place colleague I am interested in a looking into a general every-day sensor system. If the body can give a sub-conscious pre-warning of a seizure (heart-rate ?) then the individual may have time to take action to either eliminate of minimise the effect of a seizure.
So the original enquiry role has changed from that of a specific case to a general one on how to build a detection system