The purpose of this brief is to seek the services of an experienced Ecological Consultant. There are 2 ponds in Bilsdale (N Yorkshire) with the Invasive Non-Native Species (INNS) Crassula Helmsii. The consultant will undertake a full assessment of the ponds and the land around them (with various protected species in mind). Produce a detailed control plan for Crassula helmsii. Subsequently delivery and project manage the works with the aim of eradicating the weed from the sites. Monitoring and follow-up. Final report. The work could span 2021 – 2023.