Inflation pressures faced by British firms hit record levels this month, and growth in the private sector cooled only slightly from an all-time high in May when coronavirus restrictions were lifted.
The seasonally adjusted index fell to 60.6 from 72.9 in March. The March reading was the highest since March 2011 and the second highest since the PMI was launched in 2000.
Economic restrictions were tightened in some Canadian provinces in April to tackle a third wave of the coronavirus pandemic.
U.S. energy firms cut the number of oil rigs operating for the first time since March, as rigs fell by one to 438 this week, according to energy services firm Baker Hughes Co.
The seasonally adjusted index rose to 72.9 from 60.0 in February, surpassing analysts' expectations for 60.5. It was the highest level for the index since March 2011 and the second highest since the PMI was launched in 2000.
The Ivey PMI measures the month-to-month variation in economic activity as indicated by a panel of purchasing managers in the public and private sectors from across Canada. A reading above 50 indicates an increase in activity.