Indeed we can. I attach below direct quotes from GWCT.
“Does the new evidence demonstrate population scale effects occurring in species in the UK?
No, none of the new evidence, except a paper based on computer models, relates to studies in the UK, although a number of species that occur in the UK are shown to be affected.“
“There is as yet little evidence of the impact of lead on other (apart from wildfowl and game birds) species of wildlife. There is also not much knowledge about how lead shot interacts with the environment as it degrades.“
“Is this likely to result in population-level effects in any species?
Scientists know that lead shot poisoning can affect birth, death, and survival rates in wildfowl. Because of that, lead shot poisoning is capable of changing population sizes, growth rates, and demographics” Capable but not demonstrated or proven.
This does not amount to sufficient evidence to ban lead ammunition. What research there is is overwhelmingly one or more of the following: methodologically defective, biased, inapplicable to the UK, extrapolations from small, spurious or unrepresentative samples. It does not and has not demonstrated much harm.
Yet, you have continued to insist that papers making wholly unsupportable claims (on a statistical level) are not erroneous. Why on earth you think it is part of your job to keep propagating bad pseudo-science which undermines the interest of your members and all shooters is incomprehensible to me. In precisely the same way, I am baffled by those who insist in the face of the facts that the earth is flat.