Balfour Beatty:

Transient effect - complete recovery within 15mins
Carillion:
Little impact - slow and steady fall over two hours, with shares easing by 7p to then hold steady at 360p
Connaught:
Little impact - others factors came into play as share price in fact rose from 390p to 394p before softening to 386p
Interserve:
Little impact - story similar to Connaught - shares slipped at first, then rose before softening to 502p