Seeing an elderly couple argue in a supermarket Caroline and Charlie vow they will never end up like that. However when Caroline's forward friend Emma makes a blatant play for Charlie and the handsome Martin,who was at college with Caroline,seems very attentive to her,they risk being jealous of each other - until Caroline points out that this is an obstacle in the marriage to be overcome. Laura suggests Caroline look at her most seductive to stop Charlie being tempted by Emma but there is no need as she overhears Charlie telling Emma that he is not interested (thetvdb.com)