It's Not Me, It's You by Mhairi McFarlane (2015)

Perfectly enjoyable chick lit about a thirtyish woman who proposes to her boyfriend, finds out he's seeing someone else, and takes off to London to get away. 

She gets a job with a dodgy PR firm, gets involved with an investigative reporter and is being wooed back by her boyfriend. Much drama and delightful British slang ensues. She also writes a graphic novel, but that feels very much like an afterthought.