There are thought to be 850,000 people who don not know they have type 2 diabetes.
A record breaking three million people have now been diagnosed with the disease, and experts are warning unless more is done to prevent the condition, the NHS could become burdened with unsustainable costs.
Diabetes sufferer Lynda Marks said dealing with the condition is much easier once you start talking about it.
She said: "It's difficult... to begin with."
More top news
The wrestling hall of fame star 'Rowdy' Roddy Piper has died aged 61.
Labour has called for compensation from the French government to be paid to Britons affected by the chaos at Calais.
Andy Burnham warns far-left supporters of fellow Labour leadership candidate Jeremy Corbyn are putting party at risk of a 1980s-style split.