You've probably looked at High Rising Intonation, or what's often called uptalk, as part of your ENGA3 Language Variation work, so this brief article in yesterday's Guardian about its recent reported growth is quite timely. The article itself doesn't really tell us much new, but it contains some good links to previous, more detailed articles which should prove helpful. It's worth remembering that this accent has previously featured on an AQA A Language paper, so it's clearly fair game for the ENGA3 paper.
You might also find this link to the Word of Mouth Radio 4 message board interesting for different views people have on the accents and/or pronunciation of others. I can see an infectious disease and a damp spoon response in just the first 5 or 6 posts!