Not sure if it helps, but this is the thread: http://www.timetriallingforum.co.uk/index.php?showtopic=102606&view=&hl=&fromsearch=1
I found the cause to my issues were some data spikes. I've now got a more normal looking mFTP curve, which agrees with what I though over the year. The figure now comes down to a more reasonable figure at the moment.
@skinny started
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Not sure if it helps, but this is the thread: http://www.timetriallingforum.co.uk/index.php?showtopic=102606&view=&hl=&fromsearch=1