Dear Steve,
Thanks to your kind advice I gave the wiring a good looking at and found a bad connection where the transformer output wires had been crimped to the light unit wires, so problem solved. However, I would probably have bought a transformer or binned the light had it not been for your advice so thanks very much. I will of course save the website as I have a couple of light fitting driven by Chinese transformers, so just in case!!!
Kind regards Ian
