Got a flyer through the university email today about Lycamobile offering a £25 p/m deal for students for unlimited UK calls, texts, Data + International Calls and Texts (China, Canada, Hong Kong, India, Malaysia, Singapore, Thailaland, USA)
Seems like a good deal to me. They are with Orange as an MVNO, that means they get both Orange and T-Mobile signals. And if you are an international caller, then you cant go beyond £25 per month.
Not sure if Quidco will work, as you have to call them up to get this deal.