都说过境伦敦需要过境签证，我迷糊了，哪位有类似经历的请帮忙

持中国护照，美国签证，经伦敦去美国，朋友们的答复都是需要英国过境签证，但是英国外交部网页上写的不需要签证啊，是我理解错了，还是新政策，下面是该网页的内容：Direct Airside Transit Visa (DATV) nationals - 18 November 2003

In addition to needing a visa to enter the United Kingdom nationals of the countries listed below, unless exempt, also require a visa to transit through the UK, known as Direct Airside Transit (DATV). Read our Visitors guidance for more information.

Afghanistan Liberia
Albania Macedonia
Algeria Moldova
Angola Nepal
Bangladesh Nigeria
Belarus Palestinian Authority
Burma Pakistan
Burundi Rwanda
Cameroon Senegal
China, Peoples Republic of Serbia and Montenegro
Colombia (including documents issued by
Congo, Democratic Republic the United Nations Mission
of in Kosovo)
Ecuador Sierra Leone
Eritrea Sudan
Ethiopia Somalia
Gambia Sri Lanka
Ghana Turkey
India 'Turkish Republic of Northern Cyprus'
Iran Uganda
Iraq Vietnam
Ivory Coast Zimbabwe
Lebanon

Certain exemptions to this requirement have been introduced and apply to all DATV nationals. The following categories of traveller are not required to hold a DATV and may still benefit from the Transit Without Visa (TWOV) concession:

holders of valid US/Canadian visas who also hold a ticket to or from the US/Canada routed via the UK. This will include a period of 48 hours after the expiry of the US/Canadian visa for those leaving the US or Canada to allow for those who choose to leave at the very end of the validity of their visa;

行期临近，多谢帮忙

所有跟帖： 

• 你问一下英国领事馆不就得到最权威的答复了嘛！ -假博士- ♀ (0 bytes) () 02/16/2004 postreply 06:04:30

• 假博士，能回答我的前一个问题吗？你好像很懂行的。 -freshwoman- ♀ (0 bytes) () 02/16/2004 postreply 06:09:17

• 你完全没有看懂英国领事馆所贴的内容。。。 -假博士- ♀ (168 bytes) () 02/16/2004 postreply 07:36:37

• 回复：你完全没有看懂英国领事馆所贴的内容。。。 -谢谢多谢。。。。- ♀ (320 bytes) () 02/16/2004 postreply 08:42:29

• 回复：你问一下英国领事馆不就得到最权威的答复了嘛！ -问了答复不一样- ♀ (1105 bytes) () 02/16/2004 postreply 06:14:59

• 不管要不要，你去办一个总是个安全的作法吧。 -假博士- ♀ (0 bytes) () 02/16/2004 postreply 08:11:15

• 据我所知：即时专机也需要。怎么没有人回答我的问题呀？！ -freshwoman- ♀ (0 bytes) () 02/16/2004 postreply 06:07:40

• Visa is needed but not always -winsbdx- ♀ (29 bytes) () 02/16/2004 postreply 08:36:21

• 回复：Visa is needed but not always -thanks。。。。- ♀ (0 bytes) () 02/16/2004 postreply 08:45:47