Heartbeat (1992)

Gina Ward makes a surprise return to Aidensfield and Bellamy encounters a key informant who might come in useful - but finds himself in trouble when the man disappears before he can offer a tip-off about an imminent armed robbery. Meanwhile, Vernon acquires a bargain miniature railway which he hopes will impress the new estate manager, and it emerges Dr Liz Merrick may have feelings for Lord Ashfordly's recently appointed land agent.