MFTX7JRN
Incorrectly, I would suggest? The income tax would be 40% (tax code D0) and the National Insurance would be on top. So 40% would be £28,000, which gives you £42,000 but the bozos have missed off the NI that could be up to £4k or as little as £1k depending on your circumstances...
There are simple tax calculators online like
UK Tax Calculator 2017 - Updated for the 2016/2017 and 2017/2018 Tax Year that help you plan. The NI bill on here for 2016/17 is a whopping £4700 or 6.8%!!
Best
LJ