The hosts posted seven tries, with Charlie Sharples and Manu Tuilagi both scoring twice in a 54-12 victory, although Lancaster’s men could have won by an even greater margin.
Ugo Monye and Tom Johnson also crossed the line, but England head coach Lancaster conceded there were areas which need addressing ahead of the forthcoming tie against the Wallabies.
“We will take the positives – there were lots of things we did well, but also some rusty areas we will have to work on before next week, no doubt,” Lancaster told Sky Sports.
“For a first hit out against a committed Fiji side we will take it. But we’re going to have to go up several gears for next week.”
Injured Northampton full-back Ben Forden believes England will need to be much more clinical if they harbour any hopes of beating the southern hemisphere sides this autumn.
“It is always a tricky game when you play someone like Fiji, who are very gritty and very hard to put away – but England managed to do that,” said Foden. “I would give them seven out of 10.”
“There was a bit of rustiness and there are things to work on, including being clinical in the right areas as a few chances went begging and you can’t afford to do that against the big boys.
“I expect England to get to the next level, but Australia will be a massive test and we have to convert when we get to the red zone as there will only be a few chances.”
MORE: The latest football news
MORE: The latest tennis news
BIOGRAPHY: Ethan Hazard
BIOGRAPHY: Daniel Sturridge