Quite right I should have made it clear I added the last sentence (co's I can't see how to bold/underline)
The CAA Safety document doesn't say anything at all about logging the flight... SNY or otherwise.
???
This is from the document I pasted
You should be checked out and current on the aircraft. Unless you have to take over the controls you are
supernumerary and cannot log any flying time.
pretty unambiguous I'd say.