UK-Shanghai-Hong Kong - Documents Required?

Hi Everyone,

My partner and I are taking a UK - Shanghai - Hong Kong trip in early October (I understand this trip plan should be fine under the exemption).

I note one of the requirements you need for the application is your ticket to a third country with a confirmed seat and date. Does anyone know if this has to be a physically printed ticket for a future flight? Would a printed confirmation E-Mail (or similar document) suffice? I'm unsure how I would get a physical ticket before the date of the flight!

Many thanks in advance for your advice!

Jack