It matters (I think as it says in the EC booklet):

WT (Y B H) to WT+ *0.5miles
WT+ (W T) To CW *0.5miles
Traveller (Y B H) to CE *1.0miles
WT (Y B H) to CW *1.0miles (where no WT+ offered)
Club (J C D I) to First *1.0miles

I think that the first letter of the fare code is the class.

Or you can check on itn what fares are available as you should have been put in the lowest possible class bucket avaialble unless you selected flexible fares and then it will be one of the above.

Hope this helps