People seem to have a basic misunderstanding of income tax bands.
It's not just income tax bands that matter. "take home" depends on other things, such as NIC, student loans, pension/superannuation deductions, effect of withdrawal of personal allowance, interaction with other tax reliefs, such as personal savings allowance.
Then you have the interaction with state benefits, such as child benefit and tax credits at lower income levels.
If you factor in ALL the tax/benefit thresholds, cliff edges, etc., you end up with a lot of anomalies of punitive marginal "tax" rates. That, combined with other "working costs" such as travel, childcare, etc. that can vary according to hours worked, type & location of job.
It's a FACT that doctors and dentists are reducing their working hours and retiring early for tax motivated reasons as they're already being hit by the £100k personal allowance reduction and the lowering of the pension lifetime limit. Working 4 days per week instead of 5 can actually mean they end up with more money in their pocket when everything is factored in (i.e. the higher taxes, the pension tax penalties, lower travel costs, lower childcare, etc). Bringing in a higher rate of tax at £80k will make that situation worse. No wonder we have a shortage of doctors and dentists with ill conceived envy taxes!!