I did not mean to imply that you cannot keep a record on your PC/PDA/iPhone or whatever. However, do not expect an "authorised representative" to accept any other presentation than prescribed in JAR-FCL 1 or 2.
So, where to bring it along? To wherever you exercise the privileges of you licence!
Who to present it to? Try a SAFA inspector! (or just for the heck of it - try not to present it to a SAFA inspector).
JAR-FCL 1.080 (d) Presentation of flight time record
(1) The holder of a licence or a student pilot shall without undue delay present his flight time record for inspection upon request by an authorised representative