Originally Posted by
flyerCO
I thought it more the setup of airport and fact that theres no exit immigration check in UK. If passengers were dumped into airside they'd be able to get away without going through immigration.
Transit passengers are already dumped airside in the UK without going through any sort of immigration. You fly HEL-LHR-USA, you go through transit security at LHR but not immigration.
The most logical explanation to me is just the idea that UK people have ridiculously low standards for many things (quality of infrastructure, quality of housing) so they haven't bothered changing any of this.