Richard Dixon, director of WWF Scotland, said the news the leak had stopped was welcome, but pointed out it was the second serious leak in the North Sea in two years.
"We should be trying to give up our addiction to oil and gas, and not seeking it out in more difficult places with the risks to the environment that poses when things go wrong," he said
More top news
Parts of the UK will feel colder than the Arctic Circle in the coming week as bitter winds make it feel -15C in some places.
At least three people have been killed in clashes in eastern Ghouta just hours after the UN Security Council backed a 30-day ceasefire.
Very Very Cold !