Services firms are hiring more workers as the employment index rose to 52.7, as rising demand pushes up their need for extra staff.
Price pressures intensified further, however, with the index rising to 57.5. That is caused in part because of the rising price of imports, which are made more expensive due to the fall in the pound.
As the services sector accounts for most of UK GDP, the acceleration bodes well for the economy overall.
Manufacturing and construction also picked up pace in April, taking the combined PMI score to 56, also its highest level this year.
For the economy as a whole, the employment index is at its joint-highest level since the start of 2016, as factories and building firms take on more staff.
“Going full steam ahead with staff hires rising at one of the fastest rates since last summer, this relieved capacity pressures and provides a signal that service providers anticipate additional growth in the coming months,” said Duncan Brock at the Chartered Institute of Procurement and Supply.
UK economy back on the up after poor start to 2017 – Telegraph.co.uk