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Sorry to hear that you have to go back.You will need to inform the comune, I would guess by letter. You will become liable for IMU and TASI on your house as long as you own it. There may or may not be some reduction on your TARI (rubbish) if you are no longer living there. Your utilities may/will be impacted if you are no longer resident i.e. electric will cost a little more. Obviously there are the problems of maintaining the place whilst you are not there. I'm sure others will add to/ correct this, best of luck.

Thanks,hopefully will be able to visit occasionally,have a local who will keep an eye on things.

You need to go to the comune, a letter won't cut it - and go to the ufficio di immigrazione, which is also the emigration office.  There you will 'emigrate', telling them your new UK address and they will write it all down.   At that point you should also go to the comune and tell the various offices IMU/TARI etc that you are no longer resident.  Also tell ENEL and switch to a non resident tariff, as well as change your bank account to non resident. 

Thank you,hopefully will be able to do this on visit in next month or so,what documents do I need to take with me?.

Justproof of who you are and your new UK address,