The Cactus by Sarah Haywood

Meet Susan Green: a prickly, independent woman who has everything just the way she wants it.
At forty-five, she thinks her life is perfect: a London flat for one, a job that fulfills her passion for logic, and a personal arrangement that provides cultural and other - more intimate - benefits. There's no room for messy, emotional relationships.
Yet following the loss of her mother and, implausibly, the prospect of becoming a mother herself, Susan's life is about to become somewhat messier.
This sparkling debut packs a real emotional punch, its heroine as exasperating and delightful as The Rosie Project's Don Tillman. An uncompromising feminist and a fierce fighter, it's a joy to watch her bloom.