We have assessed the efficacy of using filtration vs. the conventional sampling methods and we’ve shown (in common with other researchers, e.g. Spens et al., 2016) that the detection probabilities of filter kits is higher. This is likely because the standard GCN eDNA kits only actually sample 90 ml of water, while our filter kits, which have been designed to deal with the high turbidity of ponds, typically process an order of magnitude more water. The filters are easier to deal with logistically because they don’t involve shipping ethanol, are easier to process in the laboratory, and much more resistant to contamination. Unfortunately, a move to filter-based kits is not up to us, but the evidence has been made available to Natural England along with contact details of independent scientists who they can consult, and we hope that results derived from these kits may be accepted in coming years.