Various buses and coaches have been seen in episodes of this series following the UK emergency services as follows:
Series One,1994:
999-Stay on the Line:
Stevensons of Uttoxeter Mercedes minibus
Tango 476:
Wear Buses MCW Metrobus
Solo One:
London Routemasters & Metrobuses, London Country Volvo Citybuses, Grey Green Olympians & Kentish Bus Olympian.
Series Two, 1995:
East-AM 123:
Various vehicles in Belfast including Ulsterbus/Citybus vehicles.
3-5 On Scene:
Unidentified Leyland National, white Iveco minibus involved in an RTA.
Taking Bricks:
Two Yorkshire Rider double deckers
Series Three, 1996:
196... Emergency Message:
MTL Leyland Titans and Volvo B10B
Level Two:
MTL double deckers, unidentified red Leyland Titan, CMT Buses Leyland National and others.
Series Four, 1997:
One Under:
Kentish Bus RML Routemaster, London Pride open-top Metrobus,
various London Metrobuses and Titans
TWOC:
Stagecoach Hull Volvo B10M/Plaxton 71 (K171DFS) and a Kingston upon Hull-liveried Metrobus, East Yorkshire Optare Excel.
Carriageway Chaos:
Two North Kent Express coaches including DAF/Ikarus P713RWU involved in an RTA with a lorry and a National Express coach
Echo Bravo 1-1:
Cardiff Bus MCW Metrorider 103 and Optare MetroRider 107 (M107JHB).
Uniform Bravo:
Travel West Midlands Leyland Lynx, Wright-bodied low-floor and double deckers, and unidentified red/white Plaxton Verde.
(encyclopaedic information provided by Stephen Osman - wow!)