Do I need any Tibet travel permits if I hold a HK SAR passport issued in an oversea country?

Hi, I am hoping to travel to Tibet later this year from an oversea country where I work and is it possible to enter Tibet via Lhasa using my HK SAR passport issued from this oversea country? Will I require any travel permits to travel within that place? Will there be any issues if I do not have the Home Return Certificate? Many thanks!