As a final note on how to log the (safety pilot) hours. Here's the CAA document with all the magic stuff in it. It's called LASORS 2008. It's a good read for all your logbook and flight time recording questions. It's the official CAA document. If for some reason the link doesn't work or we're into 2009+ then go to the
www.CAA.co.uk website and search for LASORS + the current year.
Here it is:
http://www.caa.co.uk/application.asp...detail&id=1591
Open the large 74mb+ document (pdf) and scroll to Section A - Appendices to Section A - Appendix B - Recoding of Flight Time. Your awnser will be on page 78 in Column F.
Supernumerary goes in column Any Other Flying or Spare and annotate as SNY.
Hope this helps,