yep £10 was the price for a good quality MDMA pill when the price and quality had stablised in the 1990s.
I know why this is happening, although I don’t do pills any more – its not a secret (there was a long report in a Dutch newspaper about it) – and basically is because the Dutch authorities realise that both sides are stubborn (they are not giving in by any means but using more complex methods of catching dealers) and the users want quality rather than quantity.
Also current NL laws mean a dealer (especially a young one) gets a higher penalty for selling contaminated / poor quality pills than good ones, whereas in England a pill with class B/C substances get less penalty. The Dutch authorities still using various methods to reduce demand for drugs, including very closely monitoring and controlling dance events and putting more social pressure on older (> age 30) long term users.
