For iphone users, you can install a widget of the Tesla app which shows miles, even though the main app is still showing km
I have both the app and widget and both show only in Kms. So that is not a workaround.
Just for the benefit of forum users I am listing the issue and workaround: This is just for the UK and Ireland forum users
1) Check whether you have the new version of App 4.4.1.824? (iPhone users) and the Android (not sure the version number)
2) Check your language/Region setting is set as UK - if it is set as US the region then you will see the odometer and mileage in miles. This is the workaround
@Simonix and others are following. However, there are reports that this changes some of the other measures like temperature in F and price in $ etc., So set according to your needs - if you have to calculate mileage everyday in a lease car etc., better to set in US as the region to avoid dividing by 1.6 all the time.
3) Some report that their widget are in miles but not the app. But this is not the case for others.
4) If you say you still have this in miles - please check the above and then let us know. It is a software issue and affect everyone if you update to the latest version.
5) I think you can not update and use the old version. As far as I know it is possible in iOS, not sure of Android. Please add your clarification whether that can be done in android phones.
6) This is a software problem and Tesla will update this - not sure who created this but looks like the teenage developers aren't well travelled enough to know that UK still uses miles not Kms as in Europe.
7) This is nothing to do with other issues like automatic wipers and headlights or FSD. They are part of the AI theme and some of the issues we face are little annoying but that is part of the wider AI philosophy and it is necessary for Tesla to stick with that philosophy rather than reverting to the $1 radar to control the wipers and headlights even though they are tried and tested. Fortunately or unfortunately depending on your views when you buy Tesla you also buy Elon's vision of the futuristic cars and that comes with the price and compromises here and now. Tesla is not just a car manufacturer like a BMW, Merc or Audi who just sells practical cars.
8) Also users are divided between using miles/kms/percentage. We can use percentage in the app but the odometer readings are still in Kms and people like us need the odometer readings every now and then and that won't be solved by keeping the battery in percentage.
I hope I've covered most of the points,