V8C

Okay, so lets see. Assuming I got a 230v ac input, 4.5v dc output transformer - putting the switch inline from the mains source to the transformer, then this should work right?
You guys seem to be saying that leds will work with ac as well? In which case then this appears to make the choice of transformer a bit easier.

FYI, background info - I'm a bit of a bodger, in that I'm buggered if I'll pay £40 - £50 for something I can probably make myself for a tenner. So in this case, rather than buying a light kit with mini led lights and a transformer that plugs into the wall socket I'm making my own with a set of mini led's that are currently batt operated and a seperately sourced transformer unit wired into a suitable mains power supply to simulate the battery input.

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Me again....

Actually I'm finding issues getting a transformer that only posts 4.5v out... most seem to be 6v+. Now if I hook 6v up to these LED's I'm going to burn them out very quickly right (or blow them immediately)???