The member you are replying to hasn't been on for three years.Hi Nick,
I had a similar instal of multiple LED GU10 mains 2core Spike lights.
We removed all of the lamps and the circuit tests met the requirements.
What I learnt from this is, never to accept the clients purchase of online lamps, that she received at a cheap price.
All the lamps were defective and goes to show that sometimes buying on line isn’t always the best option.