我在UKvisa的网站上下载了一个对我们很有利的文件Guidance-Transit(INF 20)
我的理解如下:
从英国过境有三种情况: 持有visite visa
持有Direct airside transit visa(DATV)
或是Transit without visa(TWOV)
如果在UK停留时间超过48小时,需要申请Visit Visa, 如果在24以上48小时之内,要申请visitor in transit visa
但如果在24小时之内,可以申请DAVT,但持有DAVT并不允许穿越两个机场
中国属于需要申请DATV的国家,但因为我们有法国的长居,所以我们其实属于有资格transit without visa(TWOV)的范畴,
而TWOV又明确指出我们可以: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 airport); and have a confirmed onward booking that will leav within 24 hours of your arrival in the UK.