Vintage, just to clarify your last post:
The situation you're describing applies both to UK->UK and International->UK flights? So if you're flying to a destination within the UK which is connected to the AFTN network (presumably every controlled airport is) then your FPL, combined with a DEP message is enough to initiate overdue action? You don't need to nominate an RP, just make sure that your flight plan is opened?
So, the only time you need to nominate an RP is when flying to a non-AFTN connected destination (ie. an uncontrolled field)? If the RP is on the field then he can witness the arrival so no further action is required, other than to celebrate your landing in the pub. But if the RP is not on the field (your mate Bob stays at home, or you have used some ATC unit somewhere to act as your RP) then you give them a call. And obviously you call them after landing, not before... :-)
GBALU53: ACK but how can we force every PPL to read this thread? :-)