Here's the utility in action:
Two of the various tests executing on my test E7, running Symbian Belle Refresh...
A slightly slower score here than for the E7 listed in the all-time rankings provided, but then there might be an impact from me taking a few screenshots during the test! Plus the rankings don't unfortunately, show the exact OS version of the test devices.
Written in Web Runtime, this is all slightly clunky, with garish 'connection needed' warning when it starts and with an enforced 10 second delay before you can get back to the app's start/exit screen. Still, it's useful, it's free and you can download Speed Test Your Phone here in the Nokia Store.