The decision-maker is not required to consider all material, but should have as much information as possible about the decision to ensure that no relevant
considerations are ignored. There is a distinction in this respect between matters which are so relevant that they must be taken into account, and matters which are not irrelevant but which the decision-maker is not required to consider. The relevance of a particular matter will depend on the wording of the legislation and on the facts and context of each case. Generally, the weight to be attached to a particular consideration is a matter for the decision-maker (see Tesco Stores Ltd v Secretary of State for the Environment  1 WLR 759 at 780). The Court will only intervene where the weight attached to that consideration is unreasonable.