UK regulator expresses concern as vast majority of centres visited by the BBC did not properly implement scheme

Flaws in a scheme meant to help gamblers bar themselves from 24-hour slot machine shops have been described by the industry regulator as “very concerning”, following revelations in a BBC documentary.

The Guardian has previously revealed how gambling operators are exploiting favourable planning and licensing laws to flood UK high streets with “adult gaming centres” (AGCs), which are disproportionately concentrated in the poorest areas.

The shops must offer self-exclusion schemes to customers who fear they have a problem with slot machines, which are consistently linked with higher rates of addiction than products such as sports betting.

But a documentary by BBC File on 4 Investigates, due to be broadcast on Tuesday evening, found that in one UK city 13 out of 14 venues failed to implement the scheme properly.