Can I put in a plug for Chester? Since you're going to Liverpool, it's a quick 30 minute train ride from there, and it's really a charming place to visit. I went there when I was staying with friends in Liverpool, and Chester has got to be one of the most charming cities I have been in. My friend said that it is very similar to York, which is another walled city, but on a smaller scale.
I looked up a bit of information afterwards and read that the city’s walls are the most complete ancient city walls in Britain. It really has an old-world charm with all the quaint buildings, and especially the black and white Tudor-style buildings. The streets are narrow and cobbled, with some running alongside a canal, and are lined with shops, cafes, and pubs. It really creates a charming atmosphere for strolling and exploring. And if you don’t have a fear of heights, you can even walk along the city walls. 😂
If you go, it's worth visiting Huxleys, which is a cafe that contains a porthole where you can look out and see a lovely view of the city. The tea and pastries were quite tasty as well. And the cathedral there is 930 years old and also worth a visit. It was originally a Benedictine Abbey but was "converted" during the Reformation to Church of England.
Of course, having written all this, it just occurred to me that maybe you've already been there, but I'm thinking that if you have not been to Liverpool, then you probably haven't been to Chester. Although I could be wrong. I often am. 😊