In case anyone is interested I have upgraded my Spark Huawei P7 as above. The package is found at http://consumer.huawei.com/nz/mobile-phones/support/downloads/ascend-p7-nz.htm

 

The warnings say only upgrade an L10 to an L10 but it looks like the Spark version was never going to get an updated. The non-Spark build says it is for NZ so I bit the bullet and gave it a go. The only problem I had was no Keyboard post upgrade only voice input. The solution here was to go to a PC and push out the Google keyboard which installed and works fine. All app's I have tested still work OK.

 

Some user customisation was missing such as Wallpaper but everything was there or restored automatically. So far I like it but it has only been a couple of hours. The key improvements being the notifications management. Haven't yet tried out the new camera app.