With the highest proportion of offences for drink and drug-driving, 1.98 offences per 1,000 drivers, the tiny town of Llandrindod Wells, known as small spa haven, knocked off Aberdeen from the top spot.
The survey, conducted by MoneySuperMarket, found that half of the top 20 areas for the least amount of convictions are on the periphery of London, perhaps an indication of the city's world class public transport system.
Bradford, Liverpool and Huddersfield were also found to be in the top 20 of the UK's low conviction areas.
Men were found to be more than twice as likely to drive after drinking or taking drugs as women, while drivers aged between 20 and 24 most likely to offend, with 2.5 convictions per 1,000 motorists.
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Drink-drivers face a possible six-month jail sentence, a 5,000 British pounds fine and a 12-month driving ban.
"Whatever the circumstances, the fact remains that driving while over the limit is always illegal - there is simply no excuse," Pratt added.