calculator recommendations

Hi,

Sorry for the slightly nerdy question, but I’m hoping someone can recommend a calculator please?! I’m based in the UK if that’s relevant.

I’ve only got P4 to go, and my previous calculator has mysteriously gone missing, after having got me though the previous 13 exams. I had a Casio calculator, which was fine, but there was a couple of things that annoyed me with it! Firstly, it would always display answers as a fraction by default, and I had to press a button to convert it to decimal. Secondly, the buttons were quite small, so I had to type quite slowly to avoid mistakes.

Thanks for any advice.