Oil Leak Down Front Of Engine

[slyp98]

hi all , 2003 focus 1.4 lx 46k miles , ive noticed a black stain on the driveway , further inspection reveals a leak down the front of the engine down to the sump and dripping on the ground , ive managed to find the general area its coming from , left h/side of the oil filter looking at the engine there is a sensor of somekind (crank position ?)i think its coming from here , also under the fuel rail and assorted pipes at the top of the engine is an L shaped rubber hose 25mm diameter about 100mm long coming out of the head going to a tee connector does anyone know what this part is called mine has a hole in it and there is air hissing out of it . also just noticed there is a leak coming from the thermostat housing just a dribble anyone replace one of these thanks for your help