1) You'll need at least a 2:1 honours degree from a good UK university or an equivalent international degree qualification. As well as a EEE degree, you can have a background in any discipline that involves a high degree of mathematical competence, including physics, mathematics and other branches of engineering.
2) For those with less core electronics experience, we'll expect you to have an excellent academic record. If you have a 2:2 or an equivalent degree, or industrial experience, we'll give your application individual consideration.