Firstly, thank you for your response.
Secondly, I have looked though all the menus within fluent and am still unable to find an option for RMS velocity values.
I have been instructed to extract the turbulent kinetic energy and then use Urms=sqrt(2Ke/3) to obtain values.
However, This approach does not give rise to both the axial RMS and radial RMS velocities required.
Again any help is greatly appreciated!