Matilda the Musical opened on Broadway in April 2013. In some of the reviews of Matilda, the accents were specifically referred to, which is quite rare. Here are the potted highlights...
The kids in this production are American but their accents are spot-on.
The rest of the cast members are stateside replacements who have, for only one outstanding accomplishment, gotten accents down as if they were all born across the sea.
THE NEW YORK TIMES
…the child performers have mastered their English accents nicely…
IF THERE IS I HAVEN'T FOUND IT YET
If There Is I Haven't Found It Yet by Nick Payne at the Roundabout Theatre opened in the early fall of 2012... Directed by Michael Longhurst, the cast comprised of Brian F O'Byrne, Annie Funke, Michelle Gomez and Jake Gyllenhaal. Enid Graham joined the company shortly after opening. I'm usually delighted if the accent isn't brought up in a review but in this case many reviewers chose to mention it in this case. Here are potted highlights.
But passion counts for plenty, and there's plenty to go around in this bitter little narrative about a grossly overweight (not so gross by American standards, but hey) girl named Anna, played by baby Yank thesp Funke with a badly bruised soul and a killer of a British accent, who has become the punching bag of the bullies at her school.
New York Times
Onstage, Mr. Gyllenhaal — who has starred in genre-spanning films ranging from “Brokeback Mountain” to “Prince of Persia: The Sands of Time” — is winningly at ease as he plays an uncomfortable character. His crablike sideways walk, his coherent mumbling (in a convincingly sustained British accent) and his shy yet confrontational gaze all speak persuasively of Terry’s uneasiness in navigating the new terrain of delayed-onset adulthood.
Jake Gyllenhaal, sporting a flawless working-class regional English accent in his American stage debut, eschews a star turn to take his place in a top-flight four-person ensemble. It all makes for a riveting evening of theater.
It's a suitably recessive role for the young movie star, who nails the slackerly aloofness (and British accent)...
NEW YORK POST
Nick Payne’s family drama has garnered a lot of attention because it marks Jake Gyllenhaal’s New York theater debut. Spoiler alert: He and his English accent are perfectly fine.
TIME OUT NEW YORK
Gyllenhaal is making his New York stage debut here, and it’s a beaut. Perfectly nailing a London drawl and exuding an air of rumpled, unwashed profanity leavened by flashes of wit and boyish ardor, he renders Terry an utterly vivid, laddish mensch.