LED Replacement Bulb Issue

[Wilko]

... If you say the wires might need swapping which would then supposedly mean the 2 outer light works but not the middle, then how do I get all 3 working? I'm fairly sure the wires in and out of the terminal block are correctly wired but didn't know that a normal halogen will work if the L & N are mixed up...

Hi - that was me suggested that. I was wrong, it will make no difference as the LED and halogen lamps you have are 230V AC units and are not polarity sensitive. @telectrix has the answer, I think.

 

[dmxtothemax]

I have seen a simular problem but with e28's
But it's the same issue I believe
the problem is that on the LED lamps the center contact is NOT sitting high enough to make good contact with the center contact of the lamp base.
You can sometimes fix this by prying the center contact in the base upwards slightly.
If not a dab of solder on the center contact of the lamp also works.