You need a rod license.
You will also need a permit of some description I would have thought. Most canal stretches are let to angling clubs who will sell day tickets. Either post more specifically where you intend to fish, or the general are and I am sure someone can in the former case tell you where to get a day ticket, or in the latter put you on to a local tackle shop who can tell you.
It is also worth checking depending on when you are going if the sections in question observer the close season or not.
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Around the steel no tortur'd worm shall twine,
No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook,
With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray,
And with fur-wrought fly delude the prey
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