The FTSE 100 traded flat to slightly higher on Tuesday, following a 0.4% decline in the previous session, as investors awaited more details on the US-Iran agreement that could pave the way for the reopening of the Strait of Hormuz. Among major index constituents, Rolls-Royce and submarine contractor Babcock gained more than 2% each, while banks including HSBC Holdings, Lloyds Banking Group and Barclays rose around 0.4% to 0.6%. Markets are also focused on a busy UK data calendar this week, with inflation, employment and retail sales figures due, alongside the Bank of England interest rate decision and the Makerfield by-election on Thursday. Elsewhere, the Bank of Japan raised interest rates as expected, while the Reserve Bank of Australia kept its policy unchanged.