Scientists are now conducting further research aimed at identifying multiple resistance genes in genetically modified potatoes that will thwart future blight attacks.
Non-modified plants grown in a series of series of field trials were all infected after being denied protection from chemicals. However, no-one can say at this stage how long the GM strain will hold out against blight, which is notorious for its ability to overcome resistance.
The Irish potato famine of 1845 was a disaster for the poorer people of Ireland who depended on potatoes for food and income.
A new strain of British genetically modified potato appears immune to the devastating fungus responsible for the great Irish famine of 1845, research has shown. Late blight, caused by the organism Phytophthora infestans, remains the potato farmer's greatest enemy to this day.
Each year UK farmers spend around £60 million keeping the infection at bay with pesticides. In a bad year, losses and control measures combined can account for half the total cost of growing potatoes.
In the latest of a series of field trials, conducted in 2012, the fungus was unable to break down the defences of any of the GM potatoes.
British scientists have applied to begin field trials of a genetically modified crop containing fish oil nutrients in its seeds in what could be a big boost to the fish farming industry.
An application to conduct the trials at Rothamsted Research agricultural institute has been submitted to the Department for Environment, Food and Rural Affairs (Defra) and is expected to begin from April if endorsed.
The scientists are bidding to produce the world's first sustainable plant source of fish oil omega-3 fatty acids by "cutting and pasting" genes taken from marine algae, which could help protect against heart disease.
While the fish farming industry, which consumes 80% of fish oil supplies, stands to benefit from the trials, in the long term the GM-oil could also be included in food products like margarine.
Environment Secretary Owen Paterson said he wanted the UK to have a "leading role in feeding the world" by utilising GM crops.
Mr Paterson said the Government will make the UK the "best place" for companies and research providers to carry out their work by breaking down any barriers they may face.
He acknowledged public and environmental fears but insisted that "extensive testing" was in place:
"As with all technologies, public and environmental safety is paramount.
"The truth is that products are subject to extensive testing and development in tightly controlled conditions - progressing from laboratory, to glasshouse, to field trials only when it's safe to do so."
Scientists and research companies have welcomed the Environment Secretary Owen Paterson's call for a focus on the benefits of Genetically Modified Crops, saying it "offers a way forward" on a global issue.
The Biotechnology and Biological Sciences Research Council chief executive Douglas Kell said the technology could be used to "produce enough food for a growing population with fewer inputs".
"A GM approach could offer a way forward and without it we would risk blocking a solution to major global issues. This signal of support helps to keep doors open that could help us in an ever-changing future. "
Professor Maurice Moloney from Rothamsted Research said the government's stance would put the UK back into a "leadership position" on the issue of GM crops:
"The Government's initiative puts the UK back into a leadership position in Europe on this issue and will promote a rational approach to the adoption of technologies that our farmers want and need in order to maintain their competitive position in world agriculture."
The move by Environment Secretary Owen Paterson to reopen the debate surrounding genetically modified foods has been met with mixed response by environmental groups.
Environment Secretary Owen Paterson will today say that Europe is "missing out" on GM crops, which is now used on 12% of arable land around the world:
Mr Paterson will tell representatives from industry, science and the media that GM, if used properly "promises effective ways to protect or increase crop yields":
Genetic modification (GM) is a biotechnology that is being used to make new products, in particular new types of crop plant.
In global terms the use of GM crops has increased steadily since the first commercial plantings in North America in the late 1990s.
By 2012 over 17 million farmers in 28 countries were growing GM crops on 170 million hectares, which is more than 12% of the world’s arable land.
No GM crops are being grown commercially in the UK, but imported GM commodities, especially soya, are being used mainly for animal feed, and to a lesser extent in some food products.