By Lars Mucklejohn Starling Bank has taken legal action against two dozen bad debtors as it grapples with rising defaults and a City watchdog probe into its financial crime controls. Since May, the digital-only lender has filed winding-up petitions against 24 firms that have defaulted on loans, according to court filings. Most of these companies have reported little or no business activity, the Financial Times reported. Three of the companies have never filed accounts, while another six have been dormant since they were incorporated. One debtor’s accounts claimed that for each year of trading,…