No, the UASs carry out EFT and whilst they do perform the same function of rooting out those who can't cope with the training, direct entry pilots with no experience aren't put through the equivalent of 'Flying Grading' they just go directly into JEFTS (as far as I am aware).
P.S. Isn't it a little arrogant to suggest that it can't be a good idea if the RAF don't do it?
Ok, put it another way.
Why do the different services do it differently?
Aren't they all essentially after the same final product?
If you were in charge of ALL military pilot training, would you be in favour of Flying Grading for ALL potential pilots?