London — Equifax’s regulator problem is getting worse. The credit reference provider, already reeling from American probes into the loss of data on 145.5-million customers in a computer hack, will face an investigation in the UK, where 694,000 consumers had information stolen. The UK Financial Conduct Authority (FCA) said on Tuesday that it would look into the hack, one of the biggest cyber attacks in history. The regulator has the power to fine the firm or even withdraw its authorisation, which would prevent it from running credit checks in the UK. Equifax shares have lost a quarter of their value since the company disclosed in September that hackers accessed the sensitive personal information by exploiting a previously identified software vulnerability between May and July. The data breach is already the subject of state and federal investigations in the US "Hundreds of thousands of people in the UK have been affected by the Equifax data breach," British legislator Nicky Morgan, c...

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