found out how to root this device!
Here the steps:
- Make sure you have fastboot installed on your computer: https://wiki.cyanogenmod.org/w/Fastboot
- download supersu zip from here
https://download.chainfire.eu/696/supersu/ - save it to your external sdcard
- enable developer options (settings - about - click mutliple times on the build number).
- enable OEM unlock in the developer options settings on the device.
- reboot Wileyfox Swift into fastboot mode: with the device powered down, hold the Volume Up and connect USB
- to unlock the boot loader, WARNING!!! This wipes your user data!!!
on your computer type
Code:fastboot oem unlock fastboot -i 0x2970 oem unlock-go fastboot oem unlock-go
- download latest recovery image from here
http://download.cyanogenmod.org/?device=crackling - to boot the custom recovery, on your computer type
ORCode:fastboot boot <name_of_recovery>.img
install recovery
and reboot into recovery manually (remove and reinstall battery, hold volume down and power buttons.Code:fastboot flash recovery <name_of_recovery>.img
- install supersu update zip from recovery menu (choose zip from extenal SD)
- reboot and enjoy root access


Linear Mode