Going to halfords to get new sparkplugs as my e plate s2 turbo wont start . getting fuel , spark from the leads to earth but didnt have a plug socket with me to take them out .

Any recomendations and part numbers for decent plugs ?

Also when i bought the car in november i found a plastic bag in the boot with about 5 sets of used plugs i thought it must go through a lot of plugs then thought about it today as it wouldnt start .

Is it a comon problem for plugs to burn out ?