I am sorry to interrupt my hon. Friend, who is making some extremely pertinent points, but many of my constituents who are in work receive varying pay packets. For example, one week they will work overtime but the next week they will not. Some of them, such as school meal supervisory assistants, are employed only in term time. Does she have any confidence at all from what we have heard so far that the system could be sufficiently sophisticated and robust to take into account natural human activity, which does not consist of people earning exactly the same wage for 52 weeks of the year and with exactly the same family circumstances?