Flashing GU10 LED downlights (when on), Spain.

Hi,

Struggling with the Spanish language, and could do with some help, please.
I am putting some ceilings in with new LED downlights to a house in the countryside in Spain.
I have done several rooms, with no problems, I am on the last room and thought I was finished, but when I turn the light switch on, the LEDs just flash, all at different times, about twice or once per second. After about half a minute, the wall lights start flashing aswell, dim at first, then more brightly after about 10 seconds.

There are two light circuits in the room, one is for the LEDs, 12 x GU10 with 6w LED bulbs, and the other is for 3 wall lights, with 2 low energy bulbs in each, 6 in total.
Here's where it may get specific, when I turn on the LED switch, the LEDs flash, but, when I also turn on the wall light switch with the LEDs on and flashing, the wall lights turn on normally, but turn off the LED's (stop them flashing and turn them off). When I turn the wall light switch off, leaving the LED switch still on,the LEDs start flashing again.

The wall lights turn on and off normally, by their switch.
Both switches are 2way and are not connected to eachother at the switch, which is all I can check as the spur junction box is above a plasterboard ceiling.

I tried my best to ask a Spanish electrician, but he just told me to try a different bulb, which I have done, but it makes no difference. I even tried changing the LED bulbs one at a time for a new LED bulb, which seemed pointless and in fact was pointless.
I took the switches off the wall to look, and even tried swapping the wires, just in case they were reversed, but it made no difference.
I hope I have provided a clear picture and not missed out anything obvious.
Please can someone help me?

**I have edited this post to add that the wall lights start to flash with the LEDs after a minute of the LEDs being switched on (flashing). I only just tried it and left it on for longer, so have only just noticed it.**

Having spoken to an electrician, who was no help, and time is getting on, I decided to cut through the plasterboard and run a new circuit to the LEDs.
I don't know what the problem was, I've just isolated it and run a new one instead, it's all working fine now, just had to re-do the plasterboard, which seemed quicker than how it was going with the electrician.

Please delete this thread since I don't need help any longer, thank you.

I have seen it with UK wiring where in error two lamps are in series rather than parallel. With tungsten both come on dim, with LED or CFL you can get all sorts of odd results. I would stick in a tungsten lamp and see the result.

Thank you ericmark

Borrowed Neutral can do that too on circuits with dissimilar lamps (Bulbs come up in spring and don't light up when you stick them in a lamp holder). If you have low quality control gear in the CFL's then you can get discharge from this and it will mess with LED lamps...it's a real pain.

Thank you Dr Jim, I believe this was actually the problem.