In absolute numbers, the UK is the largest market for cocaine across Europe and has the second highest prevalence rate - 2.3 per cent - behind Spain.

However, the quality of the Class A drug has declined dramatically in recent years, which the UN attributes to a crackdown on traffickers pushing prices up and leading dealers to cut the drug more.

Some seizures by police revealed substances being passed off as cocaine that were only five per cent pure.

The UN found dealers diluting their product with cutting agents such as dental and veterinary anaesthetics that mimic the effects of cocaine but are much cheaper.

The World Drug Report 2009 revealed that cocaine use increased dramatically in the UK from the mid-90s, but remained stable over the last two years.

Dr Sandeep Chawla, lead author of the report, said: "If you take year and on year there seems to be a decline in this market but there is considerable cause for concern as the UK has still in absolute terms the largest numbers in Europe."

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