To bring an equal pay claim, you need to determine a ‘comparator’, or ‘comparators’ of the opposite sex. The comparator is essentially your proof of receiving unequal pay, and needs to be or have been employed by your employer. The comparator does not necessarily need to work in the same location as you; many businesses have hubs in different parts of the UK, so in this instance your employer would need to outline the terms and conditions of your differing locations.