从爱尔兰回国在英国转机都说需要签证我看到了英国移民局官网上有这么一条,看我符合条件不.那个visanationaloraDATVnationalIfyouareavisanationaloraDATVnationalwhoisexempt,anImmigrationOffice

Question

从爱尔兰回国 在英国转机
都说需要签证 我看到了 英国移民局官网上有这么一条 ,看我符合条件不.那个visa national or a DATV national
If you are a visa national or a DATV national who is exempt,an Immigration Officer may exercise discretion and allow you pass through the UK on your way to another country outside the Common Travel Area (the UK,the Channel Islands,the Isle of Man and the Republic of Ireland collectively form a common travel area) without a visa providing that you:
* arrive at a UK port on a ship and leave on the same ship within 24 hours; or
* arrive and leave by air within 24 hours and have no intention of staying in the UK (you can travel by rail or road between two airports);
and
* have a confirmed onward booking that will leave within 24 hours of your arrival in the UK.
You must also have the documents you need:
* to enter the country you are travelling to; and
* for any other country that you may pass through on your journey.
Please note,however,that this concession is at the Immigration Officer’s discretion and there is no guaranteed right of entry.

Answer 1

最好还是有转机签证的好,虽然有很多没有转机签证也在英国转机成功的例子.
至于你复制的条文,意思是说如果你满足这些条件的话移民官可以考虑允许你无签证转机,但要看实际情况,不能完全保证你可以无签证转机.
Visa national是指必须持有签证才能在英国入境的国籍的公民,DATV national是指必须持有转机签证才可以在英国转机的国籍的公民.
DATV (Direct Airside Transit Visa)
英国现行的政策下Visa national有114个,DATV national有56个（所有DATV国家都是Visa国家）.中国既是Visa national又是DATV national,也就是说哪怕只是转机也需要转机签证,当上面你复制到这里的情况是例外.