As far as I can see Neil, nobody, including the "so called experts" as you describe them, are calling for a mass reintroduction program, moreover the right to carry about controlled trials were the full environmental impacts can be monitored and quantified.
Given that much of the peer-reviewed scientific evidence in Europe suggests that beavers are a 'keystone' species which can provide significant benefits to the riverine environment, don't you think it's a little strange the Angling Trust doesn't want to even engage in the trial process? It's a very odd position to adopt when there is so much hard scientific evidence to suggest that Beavers 'may' well be part of the solution?
How do we know that the habitat cannot support them? The only way we will ever know is through controlled trials, which of course need to include a suitable exit strategy.
Shouldn't the Angling Trust be at the heart of these trials, playing a central role in the monitoring and evaluation, rather than just sniping from the sidelines and adopting a "it won't work because we say it won't work" closed mind mentality.
Beavers weren't wiped out because of deforestation by the way, they were hunted to extinction because of their prized fur.
Beaver reintroduction isn't something we should be jumping into blindly, clearly that would be incredibly naive and irresponsible. But given what we do know about some of benefits that they provide, then surely it would be equally naive and irresponsible to not undertake controlled trials?