It is Katie's christening, and everyone is celebrating at Nicks house afterwards, when an old girlfriend of his, Gill, from the Met turns up for a visit. Nick and Gill are asked to go undercover to investigate the criminal activities of the owner of a well known gambling club. Blaketon thinks that Mr Armstrong is going to cheat in an up coming racing event by tampering with the favourite horse, ‘Fab Four'. The police are on to him, and he soon notices he's being watched so he kidnaps Gill and hides her in a horse box. Nick and Phil come to the rescue.
| Name | Type | Role | |
|---|---|---|---|
| Ron Rose | Writer | ||
| John Woodvine | Guest Star | Frank Armstrong | |
| Tom Cotter | Director | ||
| Derek Fowlds | Actor | Sergeant Blaketon | |
| Terence Skelton | Actor | Boothby | |
| Anne Stallybrass | Actor | Eileen | |
| Jonathan Linsley | Actor | Billy Black | |
| Bill Maynard | Actor | Claude Jeremiah Greengrass | |
| Alan Rothwell | Actor | Vicar | |
| Tricia Penrose | Actor | Gina Ward | |
| Dean Williams | Actor | Rod | |
| William Simons | Actor | PC Ventress | |
| Philip David | Actor | The Punter | |
| Stuart Golland | Actor | George Ward | |
| David MacCreedy | Actor | Dave | |
| Mark Jordon | Actor | PC Bellamy | |
| Richard Whitaker | Actor | Horse Wrangler | |
| Nick Berry | Actor | PC Nick Rowan | |
| Gerard Horan | Actor | D.I. Woodhead | |
| Kazia Pelka | Actor | Maggie Bolton | |
| Clara Salaman | Actor | Jill Criddle |