I think rwy 05 R still had telephone/telegraph poles when i landed there in 1977 , only remember the year as was year got married. As i recall the lights were pretty basic compared to the other approach lights and LHR and the Thmaes at Laleham was the 'outer marker' for controller guided approaches ? I remeber listening to my airband hearing controllers pass a continuous string of instructions about just above glide path or turn left 3 degrees until terminating the approach quite close in and leaving the pilots eyes to do the rest. Not sure how that would have worked with todays movements and monster widebodies