Well maybe it isn't right but this is a direct paste from the gov.UK website on tax for FY 16/17. I read that you'll pay higher rate 40% on £13K over the £43K
Income Tax rates and bands
The table shows the tax rates you pay in each band if you
have a standard Personal Allowance of £11,000.
Band Taxable income Tax rate
Personal Allowance Up to £11,000 0%
Basic rate £11,000 to £43,000 20%
Higher rate £43,001 to £150,000 40%
Additional rate over £150,000 45%