Past co-presenters have been Mervyn Stutter (Series 1-2), Jon Culshaw (Series 1-5), Emma Clarke (Series 1-5) and Jo Caulfield (Series 6), although these varied in some weeks.
In 2000–2001 the trains were retrofitted with an automated voice announcer system, featuring the voice of Emma Clarke.
The Central Line is fitted with an automated voice announcer voiced by Emma Clarke (originally Janet Mayo).
adding an audio passenger information system guided by GPS and odometer, voiced by Emma Clarke: announcements for each station name include connecting lines, and provide warnings to "mind the gap between the train and the platform"
Arthur C. Clarke | Emma Goldman | Emma | Emma Kirkby | Emma Samms | Cam Clarke | Ron Clarke | Emma Watson | Emma Thompson | Emma Bull | Emma Bonino | Warren Clarke | Queen Emma of Hawaii | Kenneth Clarke | Clarke Carlisle | Shirley Clarke | Ronald J. Clarke | Richard A. Clarke | Emma Stone | Harry Clarke | Gillian Clarke | Emma Pollock | Cyril Clarke | Susanna Clarke | Steve Clarke | Richard Clarke | Noel Clarke | John Cooper Clarke | Frederick Clarke Withers | Franklin Clarke |
Webley also composed numerous other themes for the National Theatre, Arts Theatre, ballet, and radio including Ian McMillan’s East Coast Girls, Emma Clarke's Share and Share Alike, and Neil Mossey’s Stockport So Good They Named It Once.