Ericmark - many thanks for this reply. Putting a junction box into the ceiling space is not an option. I'll take my cheap lamp back to the shop I think!
I have a new ceiling light from homebase. It has a simple 3 way connector for live, neutral and earth. I'm confused. How do I connect the taped black wire from the switch to this? I seem to have to take off the ceiling rose as there's no room for it.