The forum is a very public space.
Many people worked very hard to acquire land or to be given permission to use land.
They're not going to say where in a public space.
There are multiple threads full of advice on how to ask, how to find out who to ask, for permission to use land.
It's not straightforward because by granting 'permission' or even tacitly allowing someone to use land 'under the radar' often compromises their public liability insurances, and takes away time from their own permitted time to use woodlands for camping. Some places are very much restricted to just so many days a year.
Where ? because I know that there are huge issues with using fishing kit on different sites because the S.crayfish are carrying a disease that's killing the native ones and it's easily spread on kit, boots, etc.,
That was included in the discussions on the topic in the past, when it was advised that taking out the bigger S. crayfish was actually exacerbating the problem because they're cannibalisitic and if you take out the big ones more little ones survive to cause more destruction.
It's not a straightforward take what you want.
"You must not trap or remove any non-native crayfish in England without written permission from the Environment Agency."
from,
Get permission or a licence to trap crayfish, eels, elvers, salmon, sea trout, lamprey and smelt in England. How to apply and rules to follow.
www.gov.uk