One of the comments to the newspaper report (apparently from an airport worker) gave the cause as "hydraulic brake failure". Another factor may have been that some of the Air France Express RJs operated by Britair do not have the HGS installed (unlike Britair's own aircraft). The HGS makes the landing a very precise operation with very little dispersal of touchdown point but without it....
Another comment was it happened because the Canadair "was not fitted with wing brakes" - guess someone removed the Ground & Flight Spoilers.