As zondaracer racer says as long as it complies it will be accepted.
The Air Navigation Order does require mandatory items and LASORS details these at :
http://www.caa.co.uk/docs/33/srg_lts...Bookmarked.pdf
Section A Appendix B.
JAR-FCL IEM 1.080/2.080 also lists recommended information which is also listed on the LASORS reference.
Now that is for the UK only - other JAA members (even though there isn't JAA anymore) may require by law that the recommended information are included which do actaully incude the name of the PIC, and also the take off and landing times.
However, to practically check every nation would take forever.
So I would start complying with all of the area of Appendix B and JAR-FCL IEM 1.080/2.080 as much as you can with immediate effect.