Hovering over the ‘Political information’ tab will reveal individual topic pages where you can read up on each area. The information on these pages aims to provide a good background on the UK political system.
If you prefer to get more directly involved and scrutinise individual UK politicians, here are some very useful links to know about:
The name and contact details of your local MP can be found through http://www.parliament.uk/mps-lords-and-offices/mps/find-your-mp/
Voting records for all MPs, MSPs and MLAs are available at http://www.theyworkforyou.com/mps/
There is an independent fact-checking service that scrutinises politicians’ claims: https://fullfact.org/