Arden Grange do do a dry cat food, but it's not avalable in many shops. If you can't get hold of that you could try james wellbeloved, pets at home premium, hi life or royal canin. Or if you want grain free, orijen is good (available from zooplus) and applaws have recently brought out a new grain free dry. I feed orijen usually (for the small amount of dry I feed) but when I can't get that I feed hi life dry or james wellbeloved. Although at the moment, Mosi is eating Royal canin beauty.
For wet food I feed animonda, bozita, schmusy, cosma (all from zooplus), hi life essentials (asda - usually cheaper than felix/whiskas pouches but with more meat), tesco luxury, tesco finest, applaws/almo nature/encore (all complementary so not fed all the time). I've recently added pets at home purely wet food and they like that.