We're well into the current tax year (which started in April), so your total earnings for the year won't exceed your personal allowance of �6035. So, up until next April, you'll pay no tax.
From next April, if your pay rates remain the same and the Chancellor doesn't increase the personal allowance, you'd pay just �1.78 per week in tax. In practice, the personal allowance will almost certainly rise, so if your pay rate doesn't go up, you'll still pay no tax. (If your pay rate also rises, you might have to pay a pound or two in tax but the amount will still be very low).
Chris