I also was on 4.3 and wanted root.
I downgraded with flashtool TFT 4.1.2 rooted with vroot.
Installed lockeddualrecovery.
Put the zip rom on SD card flashed with Philz
And flashed stripped version with flashtool.
Thanks for taking the time to confirm for me
but i really need to know which ftf file i need to flash for a uk SGP311 model as the instructions seem to just point to a SGP351 file
Thanks