As mentioned above, there is no requirement for Indonesian nationals to transit LHR. (I think there's also an exemption for people with US green-cards in transit to or from the US.)
27JUL11 / 1503 UTC
National Indonesia (ID) /Embarkation Indonesia (ID)
Transit United Kingdom (GB) /Destination USA (US)
ALSO CHECK DESTINATION INFORMATION BELOW
[Visa Information - Transit] United Kingdom (GB)
[Information For Normal Passports]
TWOV (Transit Without Visa):
Visa required, except for Passengers who may be granted
permission by the Immigration authorities to enter the United
Kingdom, for a stay not exceeding 24 hours.
The following conditions must be complied with:
- passengers hold confirmed reservations for an onward flight
within 24 hours; and
- continue to a third country; and
- have no purpose in entering the United Kingdom other than to
pass through in transit; and
- hold all documents required for the next destination.
Additional Information:
- There is no passport control on traffic between "Great
Britain & Northern Ireland" and "Ireland (Rep. of)".
[[TIDFT/GB/VI/AI/ID42984]]