Useful link for all relating to the advantages and disadvantages of monopoly – http://www.bbc.co.uk/news/business-42826915
Details below of exactly where to find the relevant section with the specification for Edexcel, AQA and OCR
Edexcel spec reference 3.4.5 Costs and benefits of monopoly to firms, consumers, employees and suppliers 
AQA spec reference 4.1.5.6 The advantages and disadvantages of monopoly.
OCR spec reference P11 Evaluate, with the aid of a diagram, the advantages and disadvantages of monopoly power 
https://www.apt-initiatives.com/