Thanks for that....no, not had time to dig into it yet....but I am pretty sure that that solution will work. Will revert back in a few days (as it looks like I have to deal with some domestic issues first). As ever, thanks for your help and patience!
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pj@pj-selgbuild:~$ nmcli connection show dec6ddcf-5777-45d2-96cd-c65fde1d3a5e | grep -i dns
connection.mdns: -1 (default)
ipv4.dns: 208.67.222.222,208.67.220.220
ipv4.dns-search: --
ipv4.dns-options: --
ipv4.dns-priority: 0
ipv4.ignore-auto-dns: no
ipv6.dns: --
ipv6.dns-search: --
ipv6.dns-options: --
ipv6.dns-priority: 0
ipv6.ignore-auto-dns: no
IP4.DNS[1]: 10.1.1.3
IP4.DNS[2]: 208.67.222.222
IP4.DNS[3]: 208.67.220.220
This is weird I have eliminated the OpenDNS from the wired profile...see attached...and still it is picking it up from somewhere else. I removed it from the Chromebook and it works perfectly on that now!
Flip that switch for DNS called Automatic:
Click "Apply", and run below again:
nmcli connection show dec6ddcf-5777-45d2-96cd-c65fde1d3a5e | grep -i dns
pj@pj-selgbuild:~$ nmcli connection show dec6ddcf-5777-45d2-96cd-c65fde1d3a5e | grep -i dns
connection.mdns: -1 (default)
ipv4.dns: 208.67.222.222,208.67.220.220
ipv4.dns-search: --
ipv4.dns-options: --
ipv4.dns-priority: 0
ipv4.ignore-auto-dns: no
ipv6.dns: --
ipv6.dns-search: --
ipv6.dns-options: --
ipv6.dns-priority: 0
ipv6.ignore-auto-dns: no
IP4.DNS[1]: 10.1.1.3
IP4.DNS[2]: 208.67.222.222
IP4.DNS[3]: 208.67.220.220
pj@pj-selgbuild:~$
Makes no difference if Automatic is on or off!
Automatic should be on.
Any other profiles that became active somehow (+ sudo this time) ?
sudo nmcli connection show --active
Try disconnect network and reconnect.
And run below again:
nmcli connection show dec6ddcf-5777-45d2-96cd-c65fde1d3a5e | grep -i dns
pj@pj-selgbuild:~$ sudo nmcli connection show --active
[sudo] password for pj:
NAME UUID TYPE DEVICE
Profile 1 dec6ddcf-5777-45d2-96cd-c65fde1d3a5e ethernet enp0s25
pj@pj-selgbuild:~$ nmcli connection show dec6ddcf-5777-45d2-96cd-c65fde1d3a5e | grep -i dns
connection.mdns: -1 (default)
ipv4.dns: 208.67.222.222,208.67.220.220
ipv4.dns-search: --
ipv4.dns-options: --
ipv4.dns-priority: 0
ipv4.ignore-auto-dns: no
ipv6.dns: --
ipv6.dns-search: --
ipv6.dns-options: --
ipv6.dns-priority: 0
ipv6.ignore-auto-dns: no
IP4.DNS[1]: 10.1.1.3
IP4.DNS[2]: 208.67.222.222
IP4.DNS[3]: 208.67.220.220
Hmm! Makes no sense!
Mabe I need to make a new connection profile!
HOLD on , dont delete yet!
When you run sudo nm-connection-editor, and edit the profile, the first tab called "General" has got a setting called "Automatically connect to this network when available".
Deselect that one so the profile becomes inactive.
That way you can create new profile and review the old profile as a cheat sheet.
Too late!
But it is working now...it seems!
So, am I good to enter the OpenDNS in the pihole settings page now?
Yup.
Make sure to unselect the "Custom 1" Upstream DNS server as well on the same settings page that I believe is now set to your router IP 10.1.1.1:
Darn network manglers 
Perfect....great job as usual....thank you!
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Cheers and happy ad hunting!
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