C16 - this is the 'UK Spec' option, if you're buying from a dealer not in the UK. We get top tinted windscreen for example.

55 plate - we have a VERY strange car registration system in the UK - cars registered between 1 Sept 05 and 28 Feb 06 incl. will have a '55' on their number plate. (1 Mar to 31 Aug have '05' this year)