okay got further with Enoch and despite following the guide down to fine detail, I cant get the installation to boot by itself.
it can boot with the USB key ( selecting the Sierra install at the boot loader ) but with the USB removed, it hits the enoch loader displaying the primary and recovery partition, but when I select the primary partition, it attempts to boot then it restarts back to the DELL logo.
i tried installing, with ESP and MBR, and then UEFI ... no difference. tia
btw, does the integrated wifi work? I couldnt see it in the devices.