Moving to Italy, paid by UK employer

Hello, I’m planning to move to Italy permanently with my family, but will continue to be employed full time and paid by my UK employer. What happens with my tax? Do I pay the higher tax rate between UK and Italy, or do I become an Italy tax resident and therefore pay no more UK tax? Could you kindly indicate the document which can explain this in a little more detail? I’m an airline pilot, and I will have to visit the UK regularly, albeit for a few hours at a go, as my employer operates out of a UK airport. I will also from time to time travel to the UK for training courses and refreshers, will this impact my tax residency?

Hi,
You must complete a form P85 when you leave the UK.
This will notify us of your departure and the form also covers continuing UK income.
Get your Income Tax right if you're leaving the UK (P85). 
Thank you.