Do you mean a real bell or one like an old bicylcle bell ? I bought and installed a mains operated door bell designed for deaf people which is has a proper ring and is loud enough for me. It doesnt sound like a hand bell though. If you dont want a mechanical solution, RS components could...
Better still buy the company that called it "Chocbox", change the name to something sensible and get it properly distributed.
The producer seems to be Electro Expo Ltd.
I have found many loose terminal connections in various LV downlighter installations. These create an electrical arc risk and consequent fire hazard. The problem I have found is that many electricians seem to use use standard small 60mm junction boxes to connect LV transofrmers to the main...
If you want max light level for a given wattage, LV is best since the light is whiter and brighter, so in a kitchen LV is great, but of you want more atmosphere say in a snug/sitting room, I'd go for the softer more yellow mains halogens.
The real issue for me is the fire risk in LV...