The UK economy grew at its slowest rate since mid-2013 in the three months to January, according to the CBI.
Its survey of manufacturers, retailers and the services sector showed a balance of 6% reporting increased business, the lowest since May 2013.
The economy has had a "tough start to the year", said Rain Newton-Smith, the CBI's director of economics.
Official figures last week put UK growth at 0.5% in the last quarter of 2015, the slowest for three years.