Overcoming depression and anxiety is a postcode lottery, with a massive variation in recovery rates between regions, a report reveals.
According to the NHS figures, around two in five patients return to full health after completing a course of psychological therapy treatment.
However while the counselling is successful for 42 per cent of people across Britain, different primary care trusts (PCTs) have recorded huge discrepancies in the numbers who recover after NHS care.
Of these, Blackpool PCT fared the worst with 5.6 per cent of patients overcoming depression or anxiety disorders.
Yet Sandwell PCT in the West Midlands reported a 66.7 per cent success rate, according to the NHS Information Centre statistics.
However, the reasons for improvements were not clear cut. While 782 people went through counselling in Gloucestershire, only 21 underwent psychological therapy in Sandwell.
The recovery rates also differed from one region to another. While 49.1 per cent of those treated in the South Central area got better, this figure was only 33.2 per cent in the North West.
Paul Farmer, chief executive of mental health charity Mind, said successfully treating a mental health issue is not always as straightforward as offering a block of counselling.
"It's important to remember that everyone's needs are very different," he added.
"For people who don't improve after their allocated course of treatment is finished, it's essential that they can access alternative types of counselling or treatment, for the duration they need it in order to fully recover."
The figures for April to June were compiled as part of an examination of the NHS Improving Access to Psychological Therapies (IAPT) programme, which was launched in 2008 and is being rolled out across England.
It aims to reduce the number of people unable to work because of depression-related conditions.
It revealed that while an estimated 6.1million people suffer from anxiety and depression in Britain just two per cent gained access to treatment over the first quarter on 2011.
Care services minister Paul Burstow said: "The figures show that as access to talking therapies improves, so do recovery rates."
"Not every service has reached the goal of a 50 per cent success rate yet. But I am confident that as the programme continues to roll out, those services will catch up with the best performing services."
Chief executive of the NHS Information Centre Tim Straughan said the figures could reflect the pace of rollout of the programme.