I've held a CPL/FI for around 5 years and was never asked for a photo, so unless things have changed ( should tell you on your PPL application check-list ) I do'nt think you need one.
Easy way to check is have a look at CAA website then type in Lasors.
HTH
Also theres no such thing as a silly question, you will learn that if you are moving onto ATPL's.