By Ron Bousso and Kylie MacLellan LONDON (Reuters) -Britain’s regulator on Wednesday approved Shell’s revised plan to develop a North Sea natural gas field as the government seeks to boost domestic energy output following Russia’s invasion of Ukraine. In a statement, Shell welcomed the decision and said it plans to move ahead with the development of the Jackdaw gas field which has the potential to produce 6.5% of Britain’s gas output. British business minister Kwasi Kwarteng said the Jackdaw gas field had received final regulatory approval after it was initially rejected on environmental groun…