Yearly reports have shown that ecstasy consumption is on the low with a drop in ecstasy possession (Metropolitan Police stats).  1,197 people were caught with this drug in 2006, dropping year on year to 331 people in the latest stats available.  The main reason appears to be the difficulty with obtaining the active ingredient MDMA due to restrictions now imposed on to legitimate companies making it harder for criminals to obtain.  Seems like there are many bogus pills on the market including one user reporting that they were in possession of pills made of steroids and caffeine.