Dark comedy where MC dies and goes through the afterlife

[Bazarack]

Book is set in the UK, I read this around 2015. A dark comedic book where the MC is a young woman.
I remember MC dies and goes through different stages of the afterlife.
Only information I remember is she ends up having an*l sex with a homeless man through a plastic sheet- the man ends up being her father.
I remember vivid detailing about maggots and rotting corpses that really stuck with me.
MC may be a white woman with blonde or brown hair?

Any help would be appreciated!

[Lobstergirl, au gratin]

Literary fiction, genre fiction, or mass market fiction?
Author's gender?
Cover?