Why has Sonia taken to writing letters to her husband, posted to him in the letter-box just outside their house – love letters, on blue paper, recalling with increasing vividness the early days of their courtship and marriage?
| Actor | Role |
|---|---|
 Richard PascoMaurice Stapleton | Maurice Stapleton |
 Patrick TroughtonVictor Marsden | Victor Marsden |
 Elizabeth SpriggsSonia Marsden | Sonia Marsden |
 Brian CapronYoung Victor | Young Victor |
| WWendy SpriggsYoung Sonia | Young Sonia |
| CChristopher DriscollTrade union official | Trade union official |