Bristol passport holder travelling Vietnam 11days, Cambodia 3days then flying home but switching planes in Vietnam - do I need a visa even though not leaving airport as flying home?

Dear Jane Middle,

Thanks for your question, 

The first, we would like to inform that Bristol passport holder (England Passport ) do not need to get visa for travelling Vietnam 11days. 
The second, If you only transit to Vietnam for return home, you do not need to apply visa. However, you should note that you do not leave the Vietnam airport.

Best regards,

Ken-Evisa Support.