1.   If the parties wish to give an ordinary word some special meaning, an express definition clause should be included.

2.   If the parties do not wish to be bound by time limits there should be none in the lease.

3.   If the parties wish to adduce evidence in support of their cases, the appropriate way of determining the rent is by arbitration.

4.   A formal hearing may be dispensed with if the parties do not wish to avail themselves of their right to have one.

5.   The parties will probably wish to provide the expert with documents supporting their respective cases.

6.   Difficulties can arise if one party refuses to disclose a document which the other party wishes the expert to see.