Buy a fishing license:

https://www.gov.uk/fishing-licences/buy-a-fishing-licence

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River levels:

https://www.gov.uk/check-river-conditions-and-closures

Tides:

https://www.bbc.co.uk/weather/coast-and-sea/tide-tables

Weather:

https://www.windy.com

https://xcweather.co.uk/

https://www.metoffice.gov.uk/

Regional / Local fishing byelaws (closed seasons, trout on lures rules etc.):

https://www.gov.uk/government/collections/local-fishing-byelaws
 

Incident hotline Environmental Agency.
Telephone: 0800 80 70 60