Obviously one needs to precisely know what / how to ask.
I have received my new licence (revalidation by experience) after submitting the form 1119B, my original logbook (where the training flight was confirmed) and copies of the instructors' licence and medical.
The training flight was done with a German instructor who is not authorized to sign anything on the licence as he is not registered with the CAA, which is why I needed to provide copies of his licence & medical...