Hi Ian.
Put key into ignition and turn it to position 1 I then believe you can go to country code by pressing & holding the trip reset button, it will go to 1 first then you must press it in & out every 1/2 second until you reach 19 and stop.
The display with then show an off-on flashing log 1 off press it then go up to 10
0 = Germany
1 = Great Britain
2 = USA
3 = Italy
4 = E
5 = Japan
6 = France
7 = Canada
8 = Australia ?
set it at 1 Great Britain
Here is the link for T-CUTs excellent walk through
https://www.the75andztclub.co.uk/for...ad.php?t=55585