What is the legal test for a party to be released from an undertaking?

Northwest Territories, Canada

The following excerpt is from Northwest Territories Public Service Association v. Northwest Territories, 1979 CanLII 2581 (NWT CA):

In Cutler v. Wandsworth Stadium Ltd., [1945] 1 All E.R. 103, the same approach was taken. The remarks of Morton, L.J., found at p. 105 of the report, are of particular interest in the present appeal where he says: In the first place, the court does not vary an undertaking given by a litigant. If the litigant has given an undertaking and desires to be released from that undertaking, the application should be an application for release, and an application supported by evidence showing why the litigant should be released from the undertaking which he has given.

Other Questions

What is the test for a motion to evict a party who is unable to pay the moving party's legal costs? (Ontario, Canada)
Is it an abuse of the court’s process for a party to bring multiple legal proceedings against the same party in the same matter? (Ontario, Canada)
Does a first party insurer suffer a loss from the moment the second party insurer fails to satisfy its legal obligation to transfer a loss transfer claim? (Ontario, Canada)
Does the intent of a party to an Undertaking under a Tenement Agreement have to be considered at the time the Undertaking was entered into? (Ontario, Canada)
What is the legal test used to determine whether a party has to pay a third party's costs? (Nova Scotia, Canada)
What is the legal test for a successful party to recover costs from the successful party? (British Columbia, Canada)
What are the legal consequences if a party agrees to surrender a lease with another party? (Saskatchewan, Canada)
What is the legal test to enforce a contract where a party is not a party to the contract? (British Columbia, Canada)
Is it possible for one party to set aside a domestic contract where the other party received independent legal advice? (Ontario, Canada)
What is the test for an unsuccessful party in a personal injury case to pay the legal fees of a successful party? (Ontario, Canada)