EY and Carillion will focus on 'cost reduction and cash collection' following a torrid seven days for the firm. Last week it suffered a dramatic collapse in its share price after announcing a profit warning which saw almost £600million wiped from its value. Shares in Carillion soared more than 19 per cent, or 10.8p to 66.9p. The biggest risers on the FTSE 100 Index were Ashtead Group up 54p to 1,635p, Micro Focus International up 69p to 2,158p, Antofagasta up 19.5p to 878p, Provident Financial up 48p to 2,303p.