As per the Census of 2011, England is 15% non-white (It was 9% in 2001). That is a 67% increase in percentage in just 10 years. If the same trend continues, then England will be 25% non-white in 2021, and 42% non-white in 2031. However, I took in to account the increase in inter-racial marriages as well. So England is likely to be around 50% non-white by 2021.