Nuisance in English law
Unreasonableness

The time and duration of the activity is also taken into account when determining unreasonableness. Activities may be reasonable at one time but not at another; in Halsey v Esso Petroleum, filling oil tankers at 10am was held to be reasonable, but the same activity undertaken at 10pm was unreasonable. A private nuisance is normally a "continuing state of affairs", not a one-off situation; there are exceptions, such as in De Keyser's Royal Hotel v Spicer, where piledriving at night was considered a nuisance. In such situations, the normal remedy is to grant an injunction limiting the time of the activity. Another exception was found in British Celanese v AH Hunt Ltd, where an electronics company stored foil strips on their property which blew onto adjoining land, causing the power supply to a nearby yarn manufacturers to be cut off. A similar incident had occurred 3 years earlier and the defendants had been warned to store their strips properly; it was held that even though the power cut was a one-off event, the method of storing the foil strips constituted a continuing state of affairs, and the defendants were liable.
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