Section 20 Assumptions on which court to determine future questions.

Where under this Part of this Act any question falls to be determined by the court by reference to the circumstances at a future date, the court shall have regard to all rights, interests and obligations under or relating to the tenancy as they subsist at the time of the determination and to all relevant circumstances as they then subsist and shall assume, except in so far as the contrary is shown, that those rights, interests, obligations and circumstances will continue to subsist unchanged until the said future date.