By Sam Tobin LONDON (Reuters) – Employees and agents of a British subsidiary of mining and trading group Glencore used private jets to transfer cash to pay bribes to oil officials in West Africa, prosecutors told a London court on Wednesday. Glencore Energy UK Limited paid – or failed to prevent the payment of – millions of dollars in bribes to officials in five African countries, Britain’s Serious Fraud Office (SFO) told Southwark Crown Court on the first day of a sentencing hearing. The UK subsidiary pleaded guilty in June to seven bribery offences. Glencore, a Swiss-based multinational, sai…