"15 Provisions in relation to time work (1) Subject to paragraph (1A), time work includes time when a worker is available at or near a place of work for the purpose of doing time work and is required to be available for such work except where – (a) the worker's home is at or near the place of work; and (b) the time is time the worker is entitled to spend at home. (1A) In relation to a worker who by arrangement sleeps at or near a place of work and is provided with suitable facilities for sleeping time during the hours he is permitted to use those facilities for the purpose of sleeping should only be treated as being time work when the worker is awake for the purpose of working."
"In addition to time when a worker is working, time work includes time when a worker is available at or near a place of work, other than his home, for the purpose of doing time work and is required to be available for such work except that, in relation to a worker who by arrangement sleeps at or near a place of work, time during the hours he is permitted to sleep shall only be treated as being time work when the worker is awake for the purpose of working."
"Regulation 15 only arises in a case where a worker is not in fact working but is on call waiting to work."
"The work which was paid for under his contract by reference to the time for which he worked was, for the purposes of reg.3, his attendance as night watchman for the whole of those hours. ..[T]he fact that the respondent had little or nothing to do during certain hours when he was permitted to sleep does not take away from the fact that he was throughout in attendance as a night watchman and required at any time to answer the telephone or to deal with alarms. The employment tribunal in our view confused their estimate of the hours during which the respondent was generally active with an overall consideration of what was required of him as a night watchman at any time."
"… it is wholly inappropriate for the employer while requiring an employee to be present for a specific number of hours, to pay him only for a small proportion of those hours in respect of the amount of time that reflects what he is physically doing on the premises. The solution for an employer who wishes an employee to be present as a night watchman or the equivalent, is to provide him with alternative and additional work on the premises which enables him both to provide the employer with remunerated time and also the protection of someone on the premises for security reasons."