For flights taking off or landing at UK airfields with no assigned frequency, it would be useful if the Safetycom frequency 135.480 could be listed on the PLOG.  It might encourage people to use it!  

Incidentally, Pooleys have Safetycom listed in the frequencies section for all airfields that do not have an assigned frequency, rather than just leaving a blank.  I imagine those that operate from a farm strip would have the Safetycom frequency etched in their memory in the same way that most people would know their home base frequency without having to look it up. The issue is with people who visit uncontrolled airfields relatively infrequently (including myself!).  It is mostly simply a matter of convenience having the destination frequency printed on the PLOG, but there is a flight safety element too, in encouraging people not to approach and land in radio-silence.