The first is their "first annual energy statement":
This mentions such things as smart meters, the Renewable Heat Incentive, and a lot more. It's the shorter of the two.
The other is a document showing possible "pathways" to achieve the 80% reduction in greenhouse gas emissions by 2050. What is interesting is that it has six model scenarios, in case some things don't happen, and so sounds a lot like David MacKay has had something to do with it. It's longer - a couple of hundred pages - but you can probably get the gist from the summary material at the beginning: