Thanks everyone for your support and advice. As for the Zunsport exhaust, I have now been in communication with a member of the Zunsport team and have some news regarding this. I think you'll be interested to learn what they have said:
"The Quad exhaust conversion was a product we developed for Peugeot direct, we supplied 500 sets. Zunsport was allowed to sell direct with the approval of Peugeot once this contract was completed. Please advise what engine you have as there are three different version. I will forward the relevant fitting instructions on receipt. We are still selling this product weekly,so if you require any parts i am happy to send free of charge."
So...another top response, this time from Zunsport!!! :dance: :thumbup: :clap: :dance: :thumbup: :clap: Well done chaps...well done!! :clap: :clap:
I now have to relay this information to Peugeot which I intend to do this afternoon. However, I still have misgivings about the ability of the dealership team to actually identify the problem and I feel that this should not have to have been undertaken by me. Clearly it is possible to get hold of specific parts then!! I was advised that in their experience this wasn't possible and that it would likely require me to get a whole replacement unit.
Inaccurate!! Besides, I do quite honestly feel that it should have been on them to source a replacement as was intimated by Ron through the correspondence that he received. What I can assure you is that Zunsport can provide replacement parts...if you ask.
One cautionary word, I was informed during my conversation with Peugeot earlier in the day that Peugeot discontinued selling the Feline Kit because of "issues" with it. I'm not convinced that this is accurate given the wording of the communication that I received directly from Zunsport (who I must say have been a pleasure to deal with thus far).
I will update this thread with further developments...in real time...

Still have the mirror situation to try and resolve...*yawn*
Once again, thank you to you all for your interest, support and encouragement. I am a terribly determined kind of chap. I think the dealership thought that I would just roll over and go away B-I-G mistake!!! I am now more determined than ever to resolve it...
Oh and Figo, I will definitely be providing an accurate review of my experiences once this situation comes to a conclusion.