In message , at 06:33:27
on Thu, 29 Dec 2011, remarked:
but why will the majority changing flight go land side in the first place

How else do they change terminal?

By taking the airside transfer buses and using the infamous "Connections
Centre" to be re-screened.

Much fun for all the family at this stupidly long url:

http://www.heathrowairport.com/heath...-guide/flight-
connections/connection-guides/international-arrival/international-
departure

Where (eg) T4-T5 is timed at 105 minutes. No wonder some people think
going landside will be quicker.
--
Roland Perry