Two fatalities in successive races led to a raft of safety improvements over the National course .
Two deaths at Aintree in the days before yesterday 's big race did nothing to silence those critics who have questioned the future of the race itself .
Two fatalities in successive races led to a raft of safety improvements over the National course but two deaths at Aintree in the days before yesterday 's big race did nothing to silence those critics who have questioned the future of the race itself .