Wow, I'm truly overwhelmed by the responses received regarding this. I'm really grateful and ever so slightly surprised that so many people are willing to share their knowledge and experience and give up their time to help others less competent, I've already learned a lot and am looking forward to my A2 journey. I have contacted my local (Wakefield) dealer who will order the part I need when I decide what that is, and as the car isn't in use at the moment I haven't had chance to look under the bonnet today but hopefully will get in there tomorrow.