Ann: Confirms FY17 underlying EBITDA and impairment to goodwill, page-35

I checked my math and found I was using the wrong numbers anyhow.

Net assets are only a bit over $2.3bn. Revising down to $3.70 per share

This assumes that with a $1.5bn 'post tax' write down, you just deduct $1.5bn from the current figure for goodwill.

Figure there must be tax benefits of the write down - but if there are, I don't see why that should change the write down to the goodwill. If anything perhaps it could be a new 'tax asset'? i.e. you shouldn't report a $2.1 bn write down to goodwill as $1.5 bn 'post tax'..