We have a client with whom we have a relationship of delivering proofs of concepts only. But when it comes the time to demo they expect an early version of what would be the solution. They want databases populated with real data, look-and-feel of a finished product and other things (including features) which are trivial and no way contribute towards proving the concept.
What do you do with that? How do you handle such a situation? (I'm the developer as well as the person who will be talking to the client along with other non-developers.)