In 2001, Steve Cram's brother Kevin fell and died during a run, and wasn't identified for several days. This resulted in Cram Tags intitially, to be tied to shoe laces, but the scheme seems to have evolved into wrist bands (not circular, but fixed by tabs), with telephone back up service - see
www.cramalert.co.uk from ?20 for 1 person for 3 years, to ?10 for 1 person for 1 year, plus family ?40 for 3 years. Lack of ID does seem to be a particular problem for runners, regardless of diabetes - a few years back, a man was killed by a car when out running near Cambridge and was only identified when the Police phoned British Antarctic Survey, as he was wearing a BAS T-shirt