My two travelling companions have British Passports will they require a visa for 7 days?

Dear Madam,

We would like to confirm you that according to the Vietnam Immigration's new policy, from July 1, 2015 to June 30th 2018, Great Britain, France, Spain, German, Italy and Belarus no need Visa if they stay in Vietnam less than 15 days. However, the previous visit must be far from the next visit at least 30 days. 

Thanks,

Anna Lily (Ms.)