[Closed] Another what phone question - cheaper end of market phones

Firstly sorry for another phone question, I havent really kept up to date with phone technology the past few years.

So, my contract has finished and I was planning on going sim free but my current phone, iPhone 5, is playing up so it's time to get a new one. But I'm not paying the £30 plus/month for a new iphone when I dont use a phone enough to warrent paying that.

What is there at the cheaper end of the market? What are Nokia/Windows phones really like? I am looking for something with 4G, around 1GB data and just calls and texts. I don't use a lot of minutes as mainly email. Ideally something less than £20 would be perfect.

Any recommendations?