If you look at lasors 2004 section A appendix B
Operational conditions
A) Night
B) IFR
Nothing at all about sole use of instruments. And as i said previously you can log both at the same time if cleared IFR or only night if you are under SVFR.
Recording of pilot function time.
Point 1e with note to note 5 And you will note it definatly says co-pilot. It does state that the entry must be signed by the commander. But as an ex Instructor I have more than enough PIC time without having to count the PICUS I have declared. I presume they are a bit more strict with Integrated course straight to multicrew pilots.
The instrument flight time is to be recorded in the remarks column as directed by the * comment at the bottom. Which i did when doing my IR course. But must admit havn't bothered to do since as no ratings I wish to obtain have a sole use of instruments requirment. Which also backs up the IFR actually means Instrument flight rules not flight using Instruments only. Otherwise the wouldn't have bothered with the note.
Which is exactly how my jeppy logbook instructs you to do it.
MJ
edited to add lasors 2004 link it takes bloody ages to load so stick with it.
http://www.caa.co.uk/docs/33/LASORS.PDF