Since 2010:
EUROPE- 7/9 exams
NUCLEAR- 4/9 exams
THATCHER- 7/9 exams
WORLD POWER- 3/9 exams
DECOLONISATION- 2/4 exams (specifically. have been links with Europe questions before)
LABOUR/CONSERVATIVE TO 1963- 4/9 exams
Judging by this I would predict that decolonisation and world power are likely, and I also think there will be a labour/conservative question as there hasn't been one for a long time.