dealers. its were ive always got my stuff from and tbh isnt expensive. i went in expecting to get the lube out but was happy with the price they charged for parts. cant remember exactly how much it was but think i got fuel filter, oil filter air filter, oil, sump plug for around £30, and think the spark plugs are only around £15, however think you get get some NGK (Or something ones from halfords that are highly regarded, have a search sure you will be able to find a post about them)