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As well as helping to alter her appearance, her trainer has been credited with helping her leave the demons of the past behind.
So who is Sarah Lindsay and how did former Gavin & Stacey star Sheridan, lauded for her versatility in playing roles from Cilla Black to Mrs Ronnie Biggs, end up becoming so reliant on her?
At the Olivier Awards last month, she was frank about her struggles to get back into shape. I've still got a load, but I'm trying to lose it,' she said.
Who hasn't been tempted to imitate a glamorous girlfriend's dress sense, or up their exercise regimen in the hope of attaining a figure like their trimmer pal? For as these striking pictures show, the hugely talented actress has undergone a dramatic physical transformation in a few short weeks — and it's all down to her personal trainer, former Olympian Sarah Lindsay.
The answer, it seems, lies in her deep insecurities.
In interviews she's spoken of feeling like a 'fraud' who hasn't been found out yet.
Her cheekbones are sharpened, her jawline taut and her tummy trim.
Most startling of all is how Sheridan, left, has started to replicate the toned figure of Sarah Lindsay, right, as she rapidly drops the pounds The actress's transformation since her appearance in a Twenties-style flapper dress just six weeks ago at the Olivier Awards is staggering.