Guess Which Country Produces the Most Medical Marijuana... Guess again.

The UK is the world's largest producer and exporter of legal cannabis for medical and scientific use, according to a new report from a UN body.

Findings by the UN's International Narcotics Control Board (INCB) state the UK produced a whopping 95 tonnes of legal cannabis in 2016.

It is more than double the 2015 total of 42 tonnes and the UK's production now accounts for 44.9 per cent of the world total.

The report puts Canada in second place with 80.7 tonnes produced.

Some 2.1 tonnes was exported from the UK, making it responsible for 67.7 per cent of the world total, followed by the Netherlands (16.4 per cent).

A significant part of the UK's legal cannabis production goes towards a cannabis-based medicine called Sativex.

Produced by GW Pharmaceuticals, it is available on prescription, but only via the National Health Service in Wales.

The issue of medical cannabis was highlight recently by parents of six-year-old British boy Alfie Dingley.

They say their son, who suffers from a rare form of epilepsy, can be treated with cannabis oil but it is banned in the UK. Alfie, from Kenilworth, Warwickshire, returned from the Netherlands last month, where he had been receiving this treatment.

His parents have called on the government to let him use the medication in the UK.