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The results are in ..... my light is officially goosed.
I switched it off at the mains this morning, then left it a good 5 minutes before switching it back on.
I went out to it tonight and the light came on, waited for it to go off, gave it a few minutes before going back outside and it won't come back on.
I tried switching it off and back on but it won't come back on at all .... but I just know it'll come back on tomorrow when it goes dark again.
Oh well ..... a new light it is then :(