JAR–FCL 1.080 Recording of flight time
(See IEM FCL 1.080)
(a) Details of all flights flown as a pilot shall be kept in a reliable record in a logbook format acceptable to the Authority (see IEM FCL 1.080).
Details of flights flown under JAR–OPS 1, may be recorded in an acceptable computerised format maintained by the operator. In this case
an operator shall make the records of all flights operated by the pilot, including differences and familiarisation training, available on request to the flight crew member concerned.
You do not need to maintain a logbook provided that the company records and retains all the required details for you. Works provided that you never do any flying outside your normal employment eg Private weekend flying.