OK. If you are with an agency and you don't like what they are doing, such as paying you as a cover supervisor when you are in fact planning and marking - you should contact their head office. They probably have company policies which are compliant with such legislation as exists concerning the conduct of recruitment and employment agencies and agency workers' rights. If a school has told the agency that they want a cover supervisor for a day, they will be charged a much lower rate. However they must then expect you only to deliver a prepared lesson, no marking, no other duties and coat on, straight out of the door at 3.30. The same criteria apply then if the booking continues. A cover supervisor is only required to cover the same absent teacher for four consecutive days. If the agency fails to spot that the same booking has been renewed beyond that on the same basis, they need to act, as clearly the school is misrepresenting themselves and are causing the agency to collude in a false job description. A practice which the REC frowns upon. Increasingly, in view of the number of teachers walking off, bookings are for medium and long-term cover, this means doing the full job. It stands to reason that if you are planning, marking, preparing GCSE or SATs materials, going to meetings, dealing with discipline, contacting parents et al. you should be allowed PPA and you should request a daily pay rate that reflects the increase in responsibilities. This is not cover supervision.
Agency pay rates are entirely negotiable, so negotiate.
You're doing the work, not the consultant.
Agencies often don't know what is going on at branch level. You need to let the CEO know that there is non-compliant practice in their company. Name names. Blow the whistle.
Unfortunately most of the consultants are paid OTE, so they are desperate to make deals, which is why the less scrupulous ones resort to anything to place teachers in schools. All you have to do is say no if the pay is so low that it's not worth your while trekking around for a day or half a day's work in a dodgy school, miles from where you live, paid for less pro rata than you'd get cleaning the loos. (No disrespect to cleaners)