Moving overseas question

I'm moving overseas permanently later this year. I understand i will need to fill out and return a P85 form. Regarding the form, i dont have a permanent address overseas and intend to move around the country so what do i populate in the field? I will continue to keep my UK address where i currently live (parents house), does this change anything in terms of my registered address with HMRC?

Hi,
 

You will use current UK address and it will only change the HMRC registered address if it is different from that held on record . Thank you.