Wild Geese (2018)

When Amy catches her husband being fellated by another man, she promptly falls down the stairs, bangs her head, and wakes up in hospital believing that she is 16 and that the year is 1999. Gone is Amy's vocal fry 'Made in Chelsea' accent, and any recollection of the weak-chinned man claiming to be her husband. And instead all she cares about now is tracking down her teenage first love - a woman, Polly.