I am a founding partner of Reckon. I try to advise or inform my clients about issues in economic regulation and competition law.
My CV (2 pages, PDF) has an overview of my experience.
Please contact me if you think that I might be able to help you. I am happy to discuss your needs or your situation without any charge or obligation.
http://dcmf.co.uk/ has some other things that I am doing.
If you are interested in access charging and charging structures for regulated networks, you might enjoy some of these satirical papers.