POLICE are preparing to interview every company on a Welsh steel firm's client list in connection with their probe into the firm. Dyfed Powys Police last night said it was at the start of a lengthy investigation of Dyfed Steels Ltd in Llanelli, South Wales.

Detectives visited the company's offices a fortnight ago as part of their inquiry into alleged irregularities in respect of quality certificates for steel products issued by the firm, claims strenuously denied by the company.

Officers will contact all of the company's customers, some of whom have built the Millennium Plaza multi-cinema and bar/restaurant complex, next to the Millennium Stadium, the new £27m 20,000-seater Morfa Stadium in Swansea and helicopter parts for the Ministry of Defence.

Police are looking into allegations that original impact steel test certificates were later falsified for upgraded "passes".