I had my interview for Northumbria in November and it is all very relaxed! don't worry. They stick to the plan which they send in advance (and the timings are very exact). The presentations were very straight forward, 2 minutes on a general topic. For example, 'displays in the classroom should...' or 'children learn by...'. You work in groups of about 5-6 as well so it is not very formal and they tell you if you run over the time. Oh! and they let you swap if you don't like your topic. The maths test was ok (basic KS2 - fractions etc), although i had been on bbc bitesize to brush up on mental maths skills! English test was basically a comprehension task, very straight forward. Just relax and be yourself I worried for weeks beforehand and prepared far too much! Good luck!