Right i have an update, and it appears that i was at least partially incorrect.
below is the response i got from them which appears to be rather pragmatic, which makes a nice change!
Im slightly perturbed that the EA reckon they know where there are not white claws - since a systematic survey has not been done and their data is based on routing events and ad hock monitoring but thats not really what we were talking about here!
I would still say to disinfect kit etc, and remember the traps are not usually UK legal when bought they have to be ammended slightly. Someone here said the traps are expensive, some of the best ones are about £7 i think. So if people have a licence im happy to point them in the right direction.
So hope this is helpfull!
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Thank you for your e-mail regarding Crayfish trapping.
The trapping of crayfish is only allowed depending on a number of factors; including location and reason for trapping.
Trapping in the North of England & Wales
The use of traps to catch crayfish in the North of England & Wales (unless for scientific research, conservation, or fishery management) will normally be refused for the following reasons:
Increased risk of spreading crayfish plague and other fish diseases
The risk of capture and or harming native crayfish
Small scale trapping of Signal crayfish has been shown to increase rather than decrease their population size*
*Scientific evidence shows large males are preferentially attracted to traps, while females and small males are trap-shy. As large male signal crayfish cannibalise juveniles they have the effect of keeping total population numbers down. In areas where trapping has occurred, the removing of these large males has resulted in a dramatic increase of overall signal numbers in the years after trapping.
Trapping in the South of England
The use of traps in southern England to catch crayfish for personal consumption or as a business enterprise is likely to be approved. However, we would usually not approve the trapping of non-native crayfish in areas where there is a high risk of the native white-clawed crayfish getting caught. This is currently the case in the south west of England, especially Devon, Cornwall and Somerset.
Whilst the trapping of crayfish in the South of England is likely to be approved, our preference is for members of the public to use a rod and line because:
Traps can impact on non-target species, such as water voles, otters, amphibians
Rod licence revenue is invested into improving angling and fisheries management
A licence is required for the trapping of crayfish. We assess every application individually, there is no charge for a licence and they can last from several days to one year (depending on the the purpose of the trapping, whether for personal consumption or business enterprise).