They seem to be increasing other things.
The single supplement was raised to 40% for 2007 for categories c-h. Now from B&K, I see they have changed the single supplement surcharge for category c to 75%!!!!!
So, I do not know the anser to your question, but it seems to be a trend. I suppose the change in tours is perhaps not reaching an agreement with the tour operator in Barcelona for the tours you were interested in.
Lynn