Make sure you are seeing the UK version of your site, and then go into the ‘Customizer’.
For each of your ‘Featured Services’, select a UK page.
Now exit the customizer and go to ‘Pages’.
For each of the UK pages you selected for the featured services in the previous step, create French versions of those pages.
Now when you view the UK homepage, you will see each featured service will display the information from the selected UK pages.
Switch to the French version of the homepage, and you should see that the featured services will display the information from the French versions of those previously selected UK pages.