Regular captain Sarah Hunter drops to the bench for the second pool game of the Red Roses' title defence, resulting in Scarratt's elevation to skipper.
Natasha Hunt makes her first appearance of the tournament at scrum-half, forming a new half-back partnership with Amber Reed, while Olympian Amy Wilson-Hardy is given her World Cup debut on the wing.
England have used their driving maul sparingly so far but it proved effective in setting up Lydia Thompson's score before half-time and Amy Cokayne was on hand to score a fourth before the half-time interval after an eye-catching run from the impressive flanker Marlie Packer.
"We want to take full advantage of the depth, talent and experience in the squad". Our aim is to continually build and improve our performances.
"The team have recovered well and have been working hard over the past two days to ensure we are fully prepared for the next challenge".
As promised he includes all the players that missed out on their opening victory over Spain, including 2014 world champions Tamara Taylor, Marlie Packer and Natasha Hunt.
Waterman powered over to keep England well out in front and just after the hour-mark Middleton made a raft of changes, with Megan Jones, Harriett Millar-Mills, Heather Kerr, Vickii Cornborough and Sarah Hunter all entering the fray.