can anyone tell me what the correct plugs are for my 1.8T 2000 Halfords do Bosch plugs for £19.95 and say there are only one type listed. They also do NGK but it says there are 2 types listed depending on engine code and these cost £24.95 when i rang my local car store the quotes i was getting were £10 plus per plug! I have been told a set from audi are £47 for the set. how can the prices vary so much? i guess that audi are fitting the bosch plugs ? are they the wrong ones listed at halfords (allthough they say there are only one type) and why to the prices vary so much?