The Entry/Exit lanes were only established to enable traffic to depart and arrive at Luton when the weather conditions precluded VFR (as bookworm says, I think the conditions were more stringent in the days we were a SRZ). They were never intended for transit traffic.
We do have a local procedure to use them to depart VFR traffic with reduced coordination between TWR and APP but pilots don't need to know that, only where the VRPs are.
If you want a zone transit, just ask. N-S through the overhead is often possible, E-W through the overhead, almost never!
