The Royal Horticultural Society has changed the name of it’s pollinator friendly plant list from “Perfect for Pollinators” to “Plants for Pollinators”.  This is because some of the plants on the list contained traces of pesticides.  RHS cannot check every supplier of plants so they recommend using an organic plant nusery to avoid plants which have had pesticide treatment.

https://www.rhs.org.uk/science/conservation-biodiversity/wildlife/plants-for-pollinators