Illustrative example
Two sisters inherit their mother's house. One has lived in it rent free for two years and refuses either to sell or to buy the other out. Correspondence has stopped working.
Section 14 lets any trustee, or anyone with an interest in the property, apply for an order relating to the exercise of the trustees' functions - which includes the power of sale - or declaring the nature or extent of a person's interest. The fact that shapes this particular application is that it needs both limbs: an order about sale, and, if the shares are disputed, a declaration of what they are. The section says nothing about how the court will decide, which is section 15.
They agree an independent valuation, a three-month window for the resident sister to buy the other out at that figure, and an open-market sale if she does not.