FR UK contract is not great basic pay, but with allowances and base agreement you take almost double compared to what's on paper on offer, don't expect thus a large basic pay;
That would suggest a 3% pay rise is in fact only 1.5% as it would apply only to basic salary. As the add ons are not guaranteed the anticipated annual income is crystal ball. Why don't the so-called contractors put in their invoices for what they consider a fair rate, as my plumber does? He quotes for the job and I pay it. Curious why the tail wags the dog. But then I know why; no need for lengths of explanation.