U.K. - Dubai- Beijing- Hong Kong-,Dubai- Uk. Uk passport holder with 2 years validity left

This is a route I have planned. U.K. to Beijing with layover in Dubai of 3 hours outbound . Then inbound Hk to uk with stay in Dubai of 6 day's all on same paperwork with same airline. Have booked Beijing to Hk oneway .separate booking with Hk air exiting Beijing within 72 hours . Is this allowable as will leave and return to uk but with Hk and Dubai in between. Thanks