On the similar way I found out about Hampton Court, I managed to find an easily accessible stretch of the Grand Union Canal at near Croxley station on the Metropolitan line. At my first visit, I had no doubt that there are fish in that water: many of the inhabitants were jumping, moving on the surface.
What makes things even better is that right behing the canal, I discovered a small river running (later I found out it’s called the river Gade) which also holds some nice fish (see recent posts).
What I liked most about this place is the variety of fish that you can catch, and if you follow a few very simpe steps, catching is very easy there too! I could, for example, imagine introducing fishing for first timers/kids in that stretch – they can have quick succes and memorable time. I never went blank on this canal, landing at least 5-10 fishies in a short session is guaranteed!
And if you’re lucky enough, you can catch some chunkier fish too, like this big roach.
Go for it!