We are moving about 3 hours away next week. We've got removals booked who charge waiting time if access is not available at a reasonable time (usually about 2pm). Given the size of the move, I don't suppose we'll get there much before 1pm.
The estate agent is a 45 minute drive beyond the new house, and they hold a key.
If our vendor has already left by the time we get there, would it be unreasonable to request they leave a key hidden somewhere (or with a neighbour) so that once funds are confirmed we can get in. Otherwise it's an hour and a half round trip to pick up keys from the agent.