G60 engine won't start

G60 won't start battery spark plugs and leads are fine and fuel is fine, what is next best to check?

Are you getting fuel to the injectors?
Are you getting spark?
You can hook up a spark test lamp or attach a spark plug to No 1 cable, earth it and get someone to crank engine (make sure you when insulated gloves or hold with cloth to avoid a nasty shock).