peugeot 206 non start?

hi, im in need of some help. basically i have a 206 1.1 51 plate. it was working fine then went to start it and it wouldnt start at all. fuel priming to the engine and it seems to kick over. peugeot have said it mite be an ecu failure but there not sure. also suggested that the crank sesnor has gone? im just confused and wondered if any1 had any ideas? havent checked if theres any spark to the plugs.