I can only assume the change relates to timing of recognising...

I can only assume the change relates to timing of recognising income ie attributing too much of the long term contracts too early. If it was a gross revenues issue then profitability shouldn't be impacted. Obviously they had been planning on front loading the sales, which puts paper profits out of step with cash flow.

Still the next six months should tell the story I guess. If you think there is carnage now, wait and see what happens if they have to justify why the full year results are not meeitng guidance.