Firstly, we have the Center for Evidence-Based Crime Policy (http://cebcp.org) based at George Mason University, Virginia, considered forerunners in the advancement of research into evidence-based policing. Their website contains a number of publications and articles on many aspects concerning evidence-based policing (http://cebcp.org/evidence-based-policing/). The following article discusses community policing in an American context but the points made are nevertheless still relevant to policing in the UK. Commitment to police legitimacy link directly to Peel’s principles which underpin the values of British policing.
Community Policing and Procedural Justice – http://cebcp.org/evidence-based-policing/what-works-in-policing/research-evidence-review/community-policing/
The College of Policing are also committed to promoting evidence-based good practice in policing and also features a collection of published research – http://www.college.police.uk/en/20169.htm
Lastly, there is the Society of Evidence-Based Policing – http://www.sebp.police.uk/ which requires a signup (free) but once you have, you will have access to their library of research too.
Have a great weekend!