Revenue inspector Scott is on the lookout for fare evaders attempting to force their way through the ticket barriers. Alex and Baba join forces with the police in a sting operation along a busy stretch on one of the city's busiest bus routes.

Revenue inspectors Karen and Peter stop dishonest commuters exploiting a transport loophole.

A prolific barrier-blagger is handed an eye-watering bill for three years of illegal travel, while in east London, tube enforcement officers Karen and Peter stop passengers cheating with discounted tickets.

Undercover investigator Dan has a fresh case to crack at Kings Cross as someone pretends to `tap on' the ticket barriers with a declined debit card, before audaciously shuffling his way through the gates behind honest paying travellers.

Investigators go on the trail of a fare dodger they suspect has avoided paying for more than 600 journeys and officers monitor Hounslow trains, a hot spot for fare evasion.

The hunt is on in Surrey for a suspect thought to have evaded close to £20,000 of fares in one of South Western Railway's biggest ever fraud cases. Revenue Protection officers Michelle and Lucky expose short farers at Vauxhall. And at London Waterloo, Jack and Jack face up to an explosive passenger, while Harry has a run in with a barrier basher

Investigators Rich and Greg go on the look-out for a fare dodger thought to be scamming Transport for London for over a year, racking up more than £5,000 in unpaid fares. At Waterloo, South Western Railway revenue protection officer Sam faces a tense situation with a man caught without a valid ticket who is more focused on finding a toilet than co-operating

Revenue Protection officer Sam from South Western is verbally abused on a train to Feltham when a man without a ticket insists on confronting her throughout his journey.

At Vauxhall station, one the capital's fare-dodging ultra-hot spots, a team of six revenue protection officers from South Western Railway set a trap to block rush hour fare dodgers and their first catch is an unrepentant man who has pushed through the barrier determined not to pay. Sam and Harry go undercover on a major sting operation at Byfleet and Haw, one of the busiest fare dodging stations outside London. And on the south coast, Lauren and Dan face threats of violence from an angry and potentially dangerous passenger who refuses to pay for his travel.

Transport for London investigators Rich and Greg are on the trail of a man they believe has run up more than £1500 in unpaid fares in east London on the Elizabeth Line. At Waterloo, South Western Railway revenue protection officers Ty and Jack chase a barrier jumper, while Sharon and Carlos set up enhanced checks on the barriers at Weymouth after multiple reports of disorder and chronic fare evasion