Grand Scenic not starting

Hi, we just paid for a mechanic to service the car a month ago and can't afford another visit at the moment so hoping we can sort this ourselves. The car (Grand Scenic 2005 plate) for the last few days has taken a while to start, turning over for several seconds before kicking in, sometimes not starting at all. Spark plugs and new ignition coil were fitted a month ago. Please see this short video of how it sounds when starting up:



http://ift.tt/1tmGB9M



Comments on what might be the problem appreciated.