Hi all, I have started supply work in September and one agency I work for uses an umbrella company. They are charging me 13% on anything above £150 (on top of the weekly fee they also charge) for employer's national insurance contribution. Is this common, should they be doing it and are there ways to get around it? If I am working for half a day what rate should I be charging? Is it just simply half the day rate or should it be more? I work around the Nottingham and Leicester area and found work to be really slow, has anyone else found this as well? Thank you in advance for your comments.