Moving back to a previously rented property. CGT if it is considered my primary residence?

I own a property in the UK which I lived in, as my primary residence, before moving abroad 13 years ago. During these last 13 years the property has been rented out. I plan to move back to the UK in the summer and the property will become my primary residence again. I would like to sell it as soon as possible after moving back. Am I correct in understanding that if subsequently sold I would not need to pay any CGT as it is my primary residence? This seems a little strange as I'm sure I would need to live there for a certain period before selling, to clearly demonstrate that it is my primary residence.....but for how long, 1 month, 6 months, 1 year? Thanks.

Hi,

You may still be liable for capital gains as it has not been your primary residence for the whole period of ownership. You can see guidance here:

Private Residence Relief (Self Assessment helpsheet HS283)

Thank you.