Stephen Mangan and Claire Skinner star in the final series of the popular BBC Radio 4 comedy drama.

Bill works as an economist in a right-wing institute giving succour to bankers and businessmen. Bella teaches yoga, waters the plants in Canary Wharf and holds Proust seminars for retirees. Years ago they shared a flat before Bill got married and moved to America. Now he's back and feeling a little off-kilter, so he decides to rekindle his friendship with Bella.

Once a month they get together for lunch, where they talk about everything from politics to Proust, parenting and the perils of online dating. The only thing they've never discussed is how much they love each other...

In Marcy Kahan's delightful “platonic romantic comedy”, we join Bill and Bella as they meet, eat and disagree about everything; and, in this final series, end up ordering room service in a hotel room after too much tapas.