Rok saw half its market value wiped out following .
Shares in the construction group plunged from 30p to just 11p, before rallying to 16.8p early this morning.
The firm announced that it had discovered 鈥渟erious failings in the financial controls鈥� of its Plumbing, Heating and Electrical division, and suspended finance director Ashley Martin.
"You end up making management decisions on numbers that are effectively made up鈥�, chief executive Garvis Snook told the Daily Telegraph, adding that he felt 鈥渉ugely let down鈥�.
The City is already jittery about construction companies with large public sector workloads after .
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