140. Variation of leases; introduction.

On ordinary principles the parties to a lease may agree to vary it. This may be done to rectify a defect in the lease or for other reasons. In some situations, application to the court or the tribunal can be made if the parties cannot agree on the terms of a variation. Thus application may be made:

  1.  

    (1)     for the variation of the provisions of a lease of a flat1;

  2.  

    (2)     for the variation of insurance provisions of a lease of a dwelling house other than a flat2;

and the court also has power to modify certain covenants in leases3.

Where