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For a single .... Radio Friendly Version and Cussing Dirty Version, I purchase one and I'm told that for another 20p I can have the other version as well. Does this count as one or two downloads?
The songs the same apart from the swear words dipped out but they have different ISRC codes?
I think you will find the key is in the ISRC codes. They will probably show up twice in the midweeks as McFly did, and be combined by the final compilation of the chart.
In the "old" days (1980s) Black Box got to number one by DJs and clubs buying several different mixes of the same song on different discs. Each purchase counted as a seperate sale towards the charts. So .. nothing new there. The downloads probably count as the same song sold twice, but with a kind of 'special offer'.