Cost sharing when you have to re-position the aircraft
If I'm accepting a cost-share arrangement (friend would like me to fly him) with a PPL, and I need to fly first from my local airfield to an airfield near to my pal to pick him up, is it against the rules for us to share also the costs of the re-positioning flight when I'm the only one on board?
I've tried to search for this, but to no avail.