Television presenter Lizzy Cundy told ITV's Daybreak she "really hopes" regulation is introduced in the cosmetic surgery industry and urged people "to do their homework" before having a procedure.
More top news
Cool in the north, warmer air to the south
Police have warned the drug, known locally as "pink champagne", could be deadly.
The author said "It's been wonderful" as fans mark two decades since the children's books opened up a world of magic to millions.