phil mac

hi can anyone help,for some reason my upstairs lights in my bathroom and elec fan have gone off,also the room at the side of the bathroom,they too have gone off,the loft light which is on a switch tapped into the that lighting circuit running a 5ft hallogen has also gone off.the other upstairs 2 rooms are fine and also the landing light is to....i have checked for loose wires in the loft and connections and no fuses downstairs have tripped....the loft light was fitted over 12mths ago and worked perfectly well....any help here would be much appreciated as keep having a shower in the dark....tha