Credo Reference is a collection of online reference books. It can be browsed and searched like an encyclopedia.
For example, if you search for global warming, you are shown the topic page on climate change (“the now commonly used term, having replaced “global warming”), extracts from many books, a list of related topics (Climate change, Greenhouse gas, Kyoto Protocol, etc.), images, and a mind map.
It might be a good place to start research for your long essay or project.
A Vision of Britain through Time combines maps and population census data from 1801 to 2011. You can look up statistics for particular areas of the country. For example, here are some of the key findings about Norwich:
The population grew from 31,770 in 1801 to 132,512 in 2011.
The highest infant mortality rate recorded was 229.72 infant deaths per thousand live births in 1861, and the lowest was 3.94 in 2001.
In 1841, 50.16 per cent of all workers worked in manufacturing, but in 2011 this had fallen to 6.52 per cent.
The highest male unemployment rate recorded by the census was 14.95 per cent in 1991, and the lowest was 1.94 in 1951.
In 1911, 12.89 per cent of people were living in households with over 1.5 persons per room, but in 2011 this had fallen to .53 per cent.