Defra have announced that from 31st March 2021 it will be illegal for retailers to sell metaldehyde slug killers because of their devastating effect on other wildlife. Suppliers can still sell stocks they already have and consumers can continue to use what they have until 31st March 2022. From 1st April 2022 it will then be illegal to sell and use metaldehyde products.
Please see the official post from Defra below: