What consultations have been done with environmental bodies to create these aims and objectives? What training of staff has been done to educate them on the seriousness of this issue? There is much professional guidance and skill needed to move to a zero carbon world which are not currently being used.

4.2.3 The word 'consideration' (of low carbon energy sources) is not obliging developers to include them. It should read "To oblige the installation of low carbon energy sources as part of development proposals."
We all know that the developers' priority is profit, and so they will not include low carbon energy sources unless they are MADE to. This is a weak loophole that developers will take advantage of. It will result in failure for new buildings to make any significant progress toward net zero. Necessary retrofitting is inevitable.

4.2.4 The last resort objective will inevitably result in significant administration, salary and carbon costs which could be avoided if 4.2.3 was implemented in a meaningful way.

4.2.1 needs to be reworded as zero carbon on new builds will not be achieved or sustained - see comments under 1.3 and 4.1 above.