They compile their own unique speed ratings for every horse race in the UK and Ireland. The ratings are provided on a subscription basis, but are free to view every Wednesday.
Each day, they enter the results for all the races, including the weight, jockey, trainer, age and distance beaten, for each of the horses. Their software then uses it's algorithms (developed from analysing previous results) to calculate the finishing times for all competitors in the race.
An example of the ratings they provide is shown on their site.