I was just thinking how lucky uncle Peter was to have a whole half an hour briefing on imprests. I remember all too many occasions when you add it all up and a sinking feeling comes over you as you realise things do not balance and it's always wrong against you. If you add the uncomfortable impression that everbody is aware your carrying a large amount of instantly negotiable currency (the staff at reception know only too well whats in the envelope) then it surely is a flight safety hazard if nothing else. Perhaps the fact that the services can no longer hide behind personal liabilities exemption might be worth investigating here.