Here in the States just about any auto parts store will hook up their OBD II diagnostic tool and read the DTC (Diagnostic Trouble Codes) for free. Let's start there ~~ What are the DTC's?
It is just a guess without a code: CPS (Crankshaft Position Sensor) or RCM (Relay Control Module)
DON"T start buying parts and throwing it at your problem until you know what the problem is. Get the DTC's.
USE the search function at the top of the page on this website for more info on your stall won't start situation.