I don’t think you can get into Leicester Cathedral at the moment as major work is underway on things like making it more accessible and sustainable. You can read about what is happening on the cathedral website.
I’ve only been in there once, last October, and when it reopens, I’d like to pay another visit to see the amazing stained glass which I photographed last time. It is in a side chapel and was created by the artist Tom Denny and installed in 2016. He has his own website, where a gallery of some of his other work is available.