The country's official budget forecasters now expect gross domestic product will grow by 1.5 percent in 2018, compared with a forecast of 1.4 percent made in November.
Growth forecasts in 2019 and 2020 were 1.3 percent for both years, unchanged from the November forecast.
By 2021 the growth forecast was 1.4 percent, compared with a previous forecast of 1.5 percent. The forecast for 2022 was 1.5 percent, compared with 1.6 percent in November.
(Reporting by UK bureau; writing by Andy Bruce; editing by David Stamp)