UK Transit Visa NEEDED??
The following info is from UK Embassay website. I think per Exemption#1, we are NOT required to have a Transit visa.
S
Direct Airside Transit Visa
If you are one of the passport holders listed below and will transit the UK airside (i.e. NY-LHR LHR-destination, and not NY-LHR-LGW- destination, staying in the UK less than 24 hours) you should apply online and send your application form with all your supporting documents.
The following countries require a Direct Airside Transit Visa to transit the United Kingdom. This is the case even if you only intend to remain airside and will not pass through UK Immigration.
AFGHANISTAN, ALBANIA, ALGERIA, ANGOLA, BANGLADESH, BELARUS, BURMA (MYANMAR), BURUNDI, CAMEROON, PEOPLES REPUBLIC OF CHINA, COLOMBIA, DEMOCRATIC REPUBLIC OF CONGO (ZAIRE), ECUADOR, ERITREA, ETHIOPIA, GAMBIA, GHANA, INDIA, IRAN, IRAQ, IVORY COAST, KENYA, LEBANON, LIBERIA, MACEDONIA, MOLDOVA, NEPAL, NIGERIA, PAKISTAN, PALESTINIAN AUTHORITY, RWANDA, SENEGAL, SERBIA AND MONTENEGRO, SIERRA LEONE, SOMALIA, SRI LANKA, SUDAN, TANZANIA, TURKEY, TRNC, UGANDA, VIETNAM, YUGOSLAVIA, ZAIRE (FORMERLY DEMOCRATIC REPUBLIC OF CONGO), ZIMBABWE.
Please note however that if you are transiting en route to the Republic of Ireland, and you are a national of one of the countries above, you will require a visit visa and the exemptions below do not apply.
Exemptions: You are exempt from this requirement if:
1. You hold a valid US/Canadian visa (example) and 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.
You are in possession of an onward ticket for travel by air via the UK when leaving the US or Canada within 6 months of your last date of entry to the US or Canada with a valid US/Canadian visa (example).
You hold a USA Permanent Resident Card issued on or after 21 April 1998. To calculate this subtract ten years from the expiration date on your Alien Registration Card (example).
You hold a Canadian Permanent Resident Card issued on or after 28 June 2002 (example).
You hold a valid Category D visa (normally printed on a red/pink sticker, green stickers do not qualify) issued by EU/EEA member states, which are valid for more than 3 months (example).
You hold a valid EU residence permit.
You hold a diplomatic or service passport issued by the Peoples Republic of China.
You hold a diplomatic or official passport issued by the Government of India.
You hold a diplomatic or official passport issued by the Government of Vietnam.
If you qualify from one of the above exemptions you are not required to hold a Direct Airside Transit visa and may still benefit from the Transit without Visa concession.