The "GPDO Part 1 Class A (Larger Rear Extensions) - Background Information" page has been updated to include the following additional information:

• 26/03/2013: House of Lords, 3rd Reading - Although the Growth and Infrastructure Bill did not initially cover the proposed changes to Part 1 of the GPDO, on 26/03/2013 the House of Lords decided to amend the Growth and Infrastructure Bill by inserting a new clause that would amend the TCPA 1990 to allow local authorities to opt-out of any development order made after 01/01/2013 that grants planning permission for development within the curtilage of a dwellinghouse. This amendment (which was subsequently removed) would have meant that any future changes to Part 1 of the GPDO would not apply within the jurisdiction of any local authority that has "resolved" that the changes shall not apply (link).
• 27/03/2013: BBC - "Lords defeat 'won't change home extensions plan'" (link).