The question is about what possible advantages to the consumer could there be in:
3a) National Grid Gas having a monopoly over the operation of the NTS
b) BG regaining a monopoly in the supply of gas to domestic households
4) What are the arguments for and against Ofgem regulating the price of gas supplied to domestic households?
Thanks in advance
3a) read up natural and legalised monopolies, and what reasons the law would allow them - my favourite examples would be the Post office, nucelar power stations
b) similar to 3a
4) read up inefficiencies of monopolies. There should be a supply and demand model regarding this.