The UK Border at LPL is always a pain.
It is not helped by the fact that two corridors feed into into the immigration hall with no proper management of how the two groups of PAX merge.
I cannot understand why they employ someone to usher people forward to the desks when they could spend the money employing an extra immigration officer - totally pointless.
An IRIS gate at LPL would be great but I think the UK Border Agency lacks commitment to the system. They recently removed the IRIS gate at LGW South (the terminal is being re-modeled) and they haven't committed to replacing it.