So, there is honestly no reason to go to Warrington, unless you're going to Creamfields, which is what I did (read creamfields report). There is unfortunately no real usable public transport to go to creamfields, and it's a really long walk. I would have gotten a bike, but it was not easy to rent one either (and still a 30mn+ ride).
I ended up relying on uber, which doesn't formally cover the city, but with a bit of luck, you could get a car driving around the area. Cabs were not super timely or reliable either. The biggest issue was getting back from creamfields, the busses were limited, the taxi line was 1h+, and getting an uber on saturday or sunday was really hard.
You're apparently supposed to camp onsite, but given that it's a mud field with occasional torrential rains, and that I had lots of electronics to keep safe and charge overnight, that was a non starter, so I went the uber route and had to get very creative to get back on saturday and sunday
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So there you go for Warrington. It is neatly located between Liverpool and Manchester, so there is that :)