Fair enough? A Fair as in an exhibition?

However, a Fare is the term in travel. YMW.

To answer your question regarding I class availability there should be I class in November. However, looking at random dates in November only the 16th and 21st have I class at £163 per sector. Next available date is in late December.
All other dates are D class.

I have no idea why this is the case. Perhaps someone else will know.