Right after your question archived I think its set for  days on WPRDMA the Daily Telegraph reader opened a new section with their answer  I added links to each section pointing to the other and also added a link to your user page in the new section in an effort to call it to your attention as I think such an action was supposed to generate a notification  The new section just archived so I updated the link to it from the old section and at the same time noticed that you hadnt chimed in prompting my note There is some discussion in new section about whether under any calendar two consecutive Feb  full moons would ever occur exactly  years apart but whatever the spread the average number will be close enough to  years that it seems very likely to be the source of the story you read