Thanks, I might give them an shout tomorrow. With that part from ebay, I've seen it mentioned on other sites and in videos and I got it in my head that, that fix is for Diesel engines, think I saw an comment somewhere and I noticed that most of the posts solving the P2015 issue with this part usually were mentioning diesels. I could be wrong and that would be an inexpensive fix.
If I end up trying it myself and taking the manifold out, I think it looks fiddly but could be done. An potential issue I see is the Fuel Injectors need to be resealed when putting the manifold back in.... apparently resealed, with an special tool. I looked the tool up and it's too expensive to buy to use for an one off job. Does anyone know if there are any much cheaper alternatives to it? wait, well I did find this video but don't have that much faith in it being an viable option lol