How can I switch the speedometer to miles on my C3 Pluriel?

Hi,
I need to register with the DVLA my italian Citroen C3 Pluriel. To do so, I had (amongst other things...) to switch the speedometer to miles. I managed to do so but I cannot find the procedure on my owner's handbook to show to VCA that it is a standard feature of the car. The VCA needs a copy of the relevant part of the handbook to accept the ability to switch between Km and miles as standard feature.
Anyone can help please?
Thanks!