[3] In August 2019, Richard Wisker confirmed that he, Tallulah Greive and Theo Stevenson would reprise their roles from Millie Inbetween in an iPlayer sitcom Flatmates, aimed at an older audience.

Their parents have split up, so the two sisters are constantly swapping living with 'Mum' Sharon, (Hannah Jane Fox) and 'Dad' Tony (James Bachman, later Richard Lumsden).

Great Aunt Gloria visits, still convinced Sharon and Tony (now played by Richard Lumsden) are still married, Millie celebrates her 13th birthday, Lauren trains for a hike with the school, Millie and Fran go head to head in a spelling-bee, Craig goes to stay with his mum at Christmas when he feels left out at home, Jake and Fran's dad turns up at the flat, Mum loses her job at Sunnyshopper, Mum decides to get tips off of Amber to try to be cool, Millie's English teacher arrives at the house to talk about Millie's poem, Lauren gets all loved up with Craig's new mate, Justin, Tony and Amber split but soon get back together, Jake bonds with Craig after Mike forces Craig to look after him, Mike proposes to Sharon and the whole family go on a camping trip together.

Craig moves out to go to college and Lauren meets a boy named Declan (Richard Wisker), who later becomes her boyfriend.

Lauren deletes her social media after a message mix-up and Mum and Mike spark concern when they start to argue.

At the end of that series, Lauren leaves to start college and Millie has to decide between her Mum or Dad's holiday.