The contract that Lupus Imaging (AgfaPhoto) had with Fujifilm (the manufacturer) has ended and hasn't been renewed, so the product that is available is just what currently fills the distribution network - so in effect it has been discontinued.
Very sad to see, it was nice having cheap(er) Provia! Unfortunately it fits with the general trend of Fujifilm retreating from the analogue market
Interesting...I know that you're in the UK, but in the USA, Precisa CT was more expensive than "real" Provia 100F. I remember it being $14.95 per roll when Provia 100F was $9.95 per roll, from the same seller.