The Office for National Statistics says London's population will rise (from 7.9m in 2010) to 9m in eight years (2020) and to 10m in 2030.
It's only a prediction (and could be too high if the govt succeeds in cutting immigration) but I would be amazed if that level of demand for housing does not influence prices.
Articles in the newspaper today about the government limiting people's right to settle in the country from 2016 unless they are earning more than £35, 000. That should go well.