SkyWave and Mr. B, I'm afraid you're showing your ages! CAP407 was discontinued some years ago, since it doesn't comply with JAR-FCL1. You can still buy them because some pilot shops still have stocks.
The requirements under JAR are listed at JAR-FCL 1.080 and are quite explicit. You must log IFR time. You may also log actual instrument time in the remarks column if you wish.
Whether there is any use in recording IFR versus actual IF is a totally different question which has been covered in many threads...