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Hi. My name is*****'m looking at your question now and will post my answer or ask for more information here in a short while.
There is no problem with your plan.
If you return halfway through the 1920/21 tax year, then you may not pay tax for a while as you will be entitled to 6 months worth of unused personal allowance so you will need to contact the tax office when you start a new job to make sure HMRC issue a full tax code.
I hope this helps but let me know if you have any further questions.
You can earn £1,041 per month (£12,500 / 12) from the start of the tax year and pay no tax.