Transformer plug thingy for Habitat Christmas lights...

[EarthwormFrittataBugEnchilada]

Lights came with fitted with two pin socket, very small, two prongs one small and round the other flat, they plugged into a small black converter unit which then plugged into the wall. Have lost the converter unit, does anyone know where I can buy a new one, and what they are called? Have looked at Maplin website but don't know where to start since I don't know what it is called

Should be the same as travel plug converter I think (since the plug you describe is non-uk)

But don't they have to have the black converter bit that actually changes the voltage? Same as you get on for eg Ikea halogen lamps