During their dog walks on Hampstead Heath, two older gentlemen find their conversations about everyday aches and weather growing into an unexpected connection.
| Actor | Role |
|---|---|
 Ian McKellenPercy | Percy |
 Roger AllamFrank | Frank |
 Amari BacchusNot listed | Not listed |
 Rob BrydonNot listed | Not listed |
 Peter DavisonNot listed | Not listed |
 Stephen FryNot listed | Not listed |
 Nitin GanatraNot listed | Not listed |
 Ncuti GatwaNot listed | Not listed |
 Jessica GunningNot listed | Not listed |
 Sheila HancockNot listed | Not listed |
 Derek JacobiNot listed | Not listed |
 Felicity KendalNot listed | Not listed |
 Joanna LumleyNot listed | Not listed |
 Siân PhillipsNot listed | Not listed |
 Hugh SkinnerNot listed | Not listed |
 Wayne SleepNot listed | Not listed |
 Peter StrakerNot listed | Not listed |