A useful link here relating to Economic Growth – http://www.bbc.co.uk/news/av/business-44075316/bank-of-england-governor-mark-carney-says-the-uk-economy-will-pick-up 
See below to find the relevant section within each specification:-
Edexcel spec reference 2.5.1 a) Factors which could cause economic growth               
AQA spec reference The various demand-side and supply-side determinants of short run growth of real national income and the long-run trend rate of economic growth 
OCR spec reference P17 Evaluate the causes of economic growth in the short and long run