Plus you need a government (Dept of Environment) supplied rod license to fish at all [1]
“You need a rod fishing licence to fish for salmon, trout, freshwater fish, smelt or eel with a rod and line in:
England (except the River Tweed) Wales the Border Esk region of Scotland You must always carry your rod fishing licence when you’re fishing or you could be prosecuted.”
That licence is for fishing with a rod or line, might tickling still be legal?
Fishing rights in the UK are very strictly protected. The are many places where the public can walk along a river but are not allowed to fish.