Factbox - Key announcements in UK budget

(Reuters) - Chancellor George Osborne's annual budget handed some tax incentives to voters and small businesses ahead of an in-out June referendum on European Union membership, but he warned of slower economic growth. Here are some of the main announcements from his speech: GROWTH The independent Office for Budget Responsibility (OBR) cut its forecast for economic growth to 2 percent this year, 2.2 percent in 2017 and 2.1 percent in 2018. DEBT Public debt forecasts were raised across the board w