Just a couple of points the only branding on the Streak from 02 is an 02 splash screen on boot up and some 02 themed wallpapers and that's it. Oh and the first bookmark and the page that the Browser opens up to is set up to be 02 but this is easily changed or can even be deleted if you want.
Also the update will be coming over the air direct from Dell not from 02 as their is no 02 branding on the device for them to need to approve it thankfully.
Samsung Galaxy S3 Pebble Blue 16gb, Rom Super Nexus JB 4.1.2 Build5
Motorola Xoom UK ICS 4.0.4 32gb 3G +32gb SD Card
The only problem with common sense is that it's just not that common.