LONDON (Reuters) -Britain’s insolvency service has started formal criminal and civil investigations into P&O Ferries to look into the company’s decision to fire hundreds of workers without notice last month, business minister Kwasi Kwarteng said on Friday. The probe comes after P&O Ferries admitted to breaking the law in the manner in which it terminated about 800 staff last month to hire cheaper agency workers, a move that has since caused major backlash from politicians and workers. “I can confirm that the Insolvency Service has initiated both formal criminal and civil investigations into th…