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Hello Victoria, I am one of the experts on Just Answer and pleased to be able to help you with your question.
The 40% tax bracket kicks in at 34.5K. Now knock off your personal allowance (PA) of 11.85K leaves you with 6K of slack at the basic rate of tax [20%]. Your locum shifts will be taxed at that rate up to that level and 40% thereafter. However, you should watch like a hawk the tax code issued against the locum pay as there is always a possibility that you may be given a PA twice which will ramp up your liabilities at the end of the tax year something horrible!
I do hope that I have been able to give you some assistance.
I cannot tell you without quantitative data, only let you have a percentage guide.