Your salary spans the Basic Rate (20%) and Higher Rate (40%) bands. You pay 20% on income between £12,570 and £50,270, and 40% on income between £50,270 and £60,000.
Your estimated Income Tax on £60,000 is £11,432, giving you an effective Income Tax rate of 19.1%. Combined with National Insurance of £3,211, your total deductions are £14,643, or 24.4% of your gross salary.
Since your salary exceeds £50,270, the portion above this amount is taxed at the Higher Rate of 40%. National Insurance also drops from 8% to 2% above this threshold, providing a small offset.