That explains a lot my friend. Most people use an Indy, primarily because they have a good rep, secondly hopefully to save some wonga over dealer prices. Clearly your Indy has decided to use the Honda list price and pn to price the plugs. When no doubt with a trade prices has picked them up around £12 a pop. No matter what is stamped on them, Honda don’t make plugs, NGK & Denso do that for them. Fully accept anyone offering a service has to cover costs and make a living, but pulling yer pants down and tickling yer tonsils is really taking the piss IMO.