I’ve never so much as organised a race, but along with the popular SI-entries system, there’s also the above-mentioned Race-Tek, which is used at Peris, and gives good info on the results such as splits etc...

Ambleside I believe used some kind of hi-tech system at Fairfield Horseshoe, where we all had to cross the start mat, and cross an electronic ‘finish line’ with some kind of chip on our shoes....