Peep Show and Back star Robert Webb and Motherland's Diane Morgan have joined the cast of Sky and ABC Australia comedy Frayed. The pair will star alongside Sarah Kendall, Hacksaw Ridge's Ben Mingay, The Glades' Matt Passmore and Razzle Dazzle's Kerry Armstrong in the six-part comedy, which is produced by Guesswork Television, the production company behind Hannah Gadsby's Nanette, and Sharon Horgan's Merman. The series sees Kendall, who also appeared in Motherland, as a…