Britain's FTSE 100 index is expected to open flat on Tuesday, with futures down 0.02%. HSBC plans to issue $1.50 billion in perpetual subordinated convertible securities, while Bank of England policymakers do not have a consensus on interest rate cuts. Hedge fund Palliser Capital urges Rio Tinto to allow Australian shareholders to vote on a resolution for an independent review of its dual-listing status. Oil prices rise as the US imposes fresh sanctions on Iran, and gold holds steady near a record high. London copper edges lower.