Issues getting an Adafruit BME280 to init with Raspi Zero, Dietpi node-red-contrib-bme280

Hi All,
I'm a newbie in node red and the linux environment. I am persisting through a few configuration issues to learn this world as its blown me away with the possibilities and level of development.
After 4 days on and off this is where I am up to..

So.. I am trying to get a BME280 sensor working in Node-Red on Raspi W Zero. But have what appears to be a user permission error in node red debug terminal;

'Sensor Init failed ->Error: EACCES: permission denied, open '/dev/i2c-1'

My i2c device appears on bus 1 0x077 when viewed with i2ctools.

`'root@DietPi:~# root@DietPi:~# i2cdetect -y 1

 0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f

00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
root@DietPi:~#'`

But after numerous restarts I still get this error in node red.
''Sensor Init failed ->Error: EACCES: permission denied, open '/dev/i2c-1''

I have read through a few forums that have got me very close but I think my issue is a permission.. The node-red-contrib-bme280 page suggests I look at i2c bus page to configure i2c access, but I can't see any information, at least it's not near the surface..
This is the contents of my rules file;

sudo nano /lib/udev/rules.d/60-i2c-tools.rules

SUBSYSTEM=="i2c-dev", KERNEL=='i2c-0" , GROUP="i2c", MODE='0666" KERNEL=='i2c-[1-9]*" , GROUP="i2c", MODE='0666"

Is 666 even correct?

Running
ls -l /dev/i2c*

returns

root@DietPi:~# ls -l /dev/i2c* crw-rw---- 1 root i2c 89, 1 Nov 21 06:00 /dev/i2c-1

I'm unsure where to look next. Any ideas would be appreciated.