British passport holders are allowed to enter the Vietnam visa-free for the maximum stay of up to 15 days. Thus, it implies that as a British passport holder, you are on the exemption list of Vietnam Visa-free countries.
Czech citizens are eligible to apply for the Vietnam e-visa. Therefore, there are three valid visa options available for the Czech passport holders such as: Apply for a visa at the Vietnam embassy in the Czech Republic, also called an offline visa type.
A trip to Vietnam requires a lot more than initial planning like budget, traveling days, places to visit, and more to explore Vietnam. Thus, the primary thing requires for a Vietnam travel is a valid Vietnam visa for the Dutch citizens.
Polish citizens are required to apply for the Vietnam visa depending upon their purpose of visiting Vietnam. Further, if you are looking to explore the beauty of Vietnam with your loved ones, then you should apply for the tourist visa.