In transit through the UKhhshumon said:
This section explains how you can transit through the UK when travelling to another country. It also explains the documents that you will need to bring with you.
If you pass through the UK without staying here on the way to another country, this is called 'transiting'.
There are two types of transit through the UK:
• You will transit airside if you arrive on a flight, remain in the arrival lounge of the airport without passing through immigration control, and then depart on another flight from the same airport.
• You will transit landside if you arrive on a flight, pass through immigration control and then leave the UK within 48 hours (or 24 hours if you are travelling under the 'travel without visa' concession).
Do you need a visa to transit airside?
In transit through the UK
You transit the UK airside if you arrive here on a flight, remain in the arrival lounge of the airport without passing through UK immigration control, and then depart on another flight from the same airport.
The UK government operates a DATV system for some countries. These countries are listed under 'More information' below.
You can transit the UK airside without a visa if:
• you are a national of a country that is not in the list below; or
• you are recognised as stateless under the 1954 UN Convention relating to the Status of Stateless Persons;
• You hold a valid travel document issued by the UK government
• You are a DATV national or recognised as stateless under the 1951 UN Refugee Convention and qualify for the DATV exemption under the 'transit without visa' concession - see under 'More information' below.
If you do not meet any of the above requirements, you must get a direct airside transit visa before you can transit the UK airside.
You cannot transit the UK airside if you are on your way to or from the Republic of Ireland, the Channel Islands or the Isle of Man.
'Transit without visa' concession - DATV exemptions
If you are a national of a country covered by the DATV system, you may be able to transit the UK airside without a visa. To qualify for this exemption:
• you must arrive and depart by air; and
• your onward flight must be confirmed, and must depart within 24 hours; and
• you have proper documentation for your destination, including a visa if necessary.
Additionally, you must hold:
1) a valid entry visa for Australia, Canada, New Zealand or the USA, and a valid airline ticket for travel via the UK, as part of a journey to or from one of those countries; or
2) a valid airline ticket for travel via the UK as part of a journey from Australia, Canada, New Zealand or the USA, if you are transiting the UK no more than 6 months after the date when you last entered Australia, Canada, New Zealand or the USA with a valid entry visa for that country; or
3) a valid USA I-551 permanent resident card issued on or after 21 April 1998; or
4) an expired I-551 permanent resident card issued on or after 21 April 1998, accompanied by an I-797 extension letter issued by the Bureau of Citizenship; or
5) a valid Canadian permanent resident card issued on or after 28 June 2002[/size]; or
6) a valid Australian or New Zealand residence visa; or
7) a valid uniform format category D visa for entry to a state in the European Economic Area (EEA); or
8) a valid uniform format residence permit issued by an EEA state under Council Regulation (EC) number 1030/2002; or
9) a valid UK residence card; or
10) a valid EEA family permit issued by the UK government; or
11) a diplomatic or service passport issued by the People's Republic of China; or
12) a diplomatic or official passport issued by India; or
13) a diplomatic or official passport issued by Vietnam.
http://www.ukba.homeoffice.gov.uk/visas-immigration/transitthroughtheuk/visa-transit-airside/
I need to change terminals at Heathrow. Can I transit airside?
Posted on August 25, 2012 by ukvisablogowner
Heathrow's terminals are connected by dedicated buses that transport passengers from one terminal to another airside. If your baggage has been checked through to your final destination, you will not have to pass UK immigration control; the buses are part of the airport's internal airside transit system.
If your baggage has not been checked through to your final destination, you will have to pass immigration control to re-check your baggage. It is important therefore to check with your airline whether or not your luggage will be checked through. Some passengers require transit visas to transit UK airports. It is also important therefore to check whether or not you require a transit visa and if so, if you are eligible for the transit visa waiver concession. For more information about transit visas and the UK's transit visa waiver concession, please visit our Airside Transit without Visa Concession page here, and the UKBA website.
http://ukimmigrationspecialist.com/2012/08/25/i-need-to-change-terminals-at-heathrow-can-i-transit-airside/
Experience people may explain better
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