Got TW North Lanarkshire working using Tuxbox Commander.
1. Press blue button, select Tuxbox Commander
2. Scroll to VAR, press ok, scroll to Keys, press ok.
3. Scroll to Keylist.txt, press 4 (to edit. Only works if you have set attributes to 755)
4. You should be looking at a list of keys, I had 5
5. Scroll to the code you want to change, press OK, when you press this, it makes the text larger.
6. Scroll to the digit you need to change and press OK and change to the required digit.
7. Once changed, press home button, save changes.
8. Press home to go back to TV screen.
9. Press D-box button, select reboot.
This worked for me, I'm using Evocam. Keys are available from previous posts.
Hope it helps. I'm away to watch Shameless
Del