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Hello, it wasn't your fault at all. The P45 is now electronic and your new employer should have picked it up. The emergency code is actually your standard personal allowance. It will all correct itself when you self assess. It is definitely a Dad's Army, 'Don't panic,' situation!
If it were in 2015 then the new employer would have issued a P46 to their tax office and the whole matter would have been resolved witung the tax year of jib change. Who are 'they' who are asking for 845 quid?
You wouldn't, it would be the new employer's responsibility! Tell HMRC to take a running jump and appeal against their demands which you do simply by writing a letter.
Just keep on making appeals and you letters will rise through the tax office jierarchy until they finally reach an operative who knows what they are doing.
Thank you for your support.