Well it all depends on what your priority / timescale is?
If you haven't rooted yet - if you do install the OTA update which will move you on to v1.3 (20131016.200812) then you will gain improved wifi signal strength and some other bug fixes, which could be important. After quite a bit of researching, my opinion has changed with regard to 'Kingoapp' 1-click rooting solution. This will enable you to gain root access to your hudl and is probably the easiest way to obtain it with virtually no work on your part (relatively speaking)
With regards to all the Tesco stuff - this can easily be 'disabled' via the 'All' tab in the apps section in settings on the hudl - even without root - they are just normal apps.
The [T] button (as far as I have experienced) just launches the TLauncher.app so therefore with that app disabled it doesn't do ANYTHING - it just sits on the lower left in the soft buttons area of the screen. If you still don't like it visible, you have two options: -
- Install and use 'full!screen' app - which can hide all soft buttons into the corners and gives more configurations (have a look in the Play store).
- You can wait until someone(personally I'm looking but it's not a high priority) have examined the SystemUI.apk to determine what others before us did to remove(hide) the [T] soft button from the display and then implement that in the v1.3 version of said file. Once this has been done, it's generally quite simple to then transfer this to the hudl and replace the stock v1.3 file.
Hope that helps, maybe have a look at the things suggested and see what you think you'd prefer.