We had Mk 5s in Cyprus in the 80's and they were fine in terms of serviceability - must have been the sunshine
Not sure about the emergencies section being the biggest - the Sea King was bigger and the emergencies section in the RFM for the 139 dwarfed that.
Only 14 double sided pages in my Sea King FRCs, Wessex FRC long ago was donated to another pilot but the Wx 60 was very reliable in NW Australia, even in the regular 36*C days.