It’s very much the pile it high sell it cheap model and as long as you don’t need extras, such as Wi-Fi hotspots, it should be fine. It works on the Three network, as does Smarty, so that might be an issue depending on where you expect to use the phone. Like pretty much all virtual providers support is online only. I don’t think they support e-SIMs if that is important.
If Three is a problem might be worth looking at Lebara (Vodafone) or Sky/Tesco/Gifgaff (O2). Finally it’s worth looking at both USwitch and MoneySavingExpert as they occasionally have exclusive deals to save a bit more.