Originally Posted by
jfidler
If the lines for transfer security are long, you may want to go through arrivals immigration then departure security, particularly if you hold an EU passport (immigration will be fast). I have done this in the past and plan to do it again when I transit LHR next week. Transfer security lines can be really long compared to departure security.
Justin
Very true, although there are some times that are exceptions to that. For T3-T3 or T3 to other terminals, I sometimes check out the transfer line and then if I don't like it, I head landside. For EU member state nationals, this should be easy enough .... and it even (generally) works for others who don't need a visa to enter the UK.