Brexit uncertainty alongside the weak economic conditions were acting as “millstones” on the sector’s performance, he added.
Inflation fears are receding after the slowest rise in prices charged by firms since last summer.
The pound weakened further to four-month lows below $1.36, as financial markets judged the chances of a rate hike as ever more remote.
Pantheon Macroeconomics’ Samuel Tombs said: “Following today’s data, nobody can have strong conviction that the economy’s first-quarter slowdown will be just a blip.”