A former teller at a London branch of Nationwide has been jailed following a £130,000 fraud uncovered by a joint investigation involving the Financial Conduct Authority (FCA), the City of London Police and the National Cyber Crime Unit (NCCU).
Nathan Gilbert, 26, of Enfield, north London, pleaded guilty at Southwark crown court to fraud by abuse of position and was sentenced last week to two years and three months in custody.
What made the case particularly serious, investigators said, was Gilbert's conduct when the victim visited the Muswell Hill branch in person to raise concerns about suspicious transactions on her account. Rather than helping her, Gilbert and a colleague told her that the investigation she had heard about was itself a scam — that she was being targeted by fraudsters posing as authorities. Exploiting the trust customers place in bank staff, they used their insider knowledge to make the reassurance appear credible. The victim left the branch believing she was safe. She was not. The FCA described this deliberate suppression of a victim's complaint from within a regulated institution as one of the most serious aggravating factors in the case.
Gilbert's accomplice, Daniel Frank, 46, of East Finchley, had no connection to the branch but played a central role in turning stolen account details into cash. He was sentenced this week to three years and four months.
Between October 2020 and September 2021, Gilbert accessed customer records at the Muswell Hill branch and altered account details, enabling Frank to organise runners — individuals posing as genuine customers — to attend branches and withdraw funds or make unauthorised changes to accounts. A total of £130,000 was taken from multiple victims, all of whom have since been refunded by Nationwide.
The fraud was initially flagged by Nationwide's internal compliance team and referred to the Dedicated Card and Payment Crime Unit (DCPCU). As the scale of the operation became clear, the case was escalated to a multi-agency task force involving the City of London Police, the FCA and the NCCU.
Det Sgt Steven Brown of the City of London Police, who led the arrest operation, said the case demonstrated the growing threat posed by insiders within financial institutions. "Gilbert had access, knowledge and the trust of customers — and he weaponised all three," Brown said. "The involvement of the cyber crime unit was critical in tracing the digital trail that connected Gilbert's actions inside the branch to Frank's network outside it."
CCTV from multiple branches, combined with analysis of Gilbert's mobile phone messages and banking system logs recovered by the NCCU, established a clear chain of communication between Gilbert and Frank. Gilbert was arrested in October 2021. Frank was arrested five months later. Both men's devices contained messages directly linking them to the defrauded accounts.
Both pleaded guilty. At sentencing, the judge remarked that Gilbert's decision to actively mislead a victim who had come to the branch seeking help represented a deliberate and calculated betrayal of the public's trust in banking staff.
Det Con Colin Calvert, who worked the case for the DCPCU alongside Brown's team, said: "Gilbert abused his position of trust at the bank, liaising with Frank to callously steal over £130,000 from unsuspecting victims. But what sets this case apart is that when one of those victims came to him for help, he looked her in the eye and told her the investigation was a scam. That level of manipulation is deeply troubling."
"The collaboration between the DCPCU, the FCA, City of London Police and the National Cyber Crime Unit meant we could build a case that no single agency could have constructed alone. This sentencing sends a clear message: insider fraud will be pursued with every tool available to us."
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A Nationwide spokesperson said: "While employee fraud is rare, we take it extremely seriously. We have robust procedures in place to detect suspicious activity, and we cooperated fully with all agencies throughout this investigation."
"We are deeply sorry to the customers affected. All those impacted have been fully refunded. We continue to review our internal controls to ensure that the trust our customers place in us is never exploited in this way again."
More than £1.2bn was stolen through fraud in the UK last year, with nearly 3 million cases reported. Insider fraud — carried out by employees within financial institutions — remains among the hardest to detect and prosecute, particularly when branch staff actively work to suppress victims' concerns.