I am grateful to my hon. Friend for the question. It is a very important market. Obviously, recent oil prices rises have had an impact at the petrol pumps. It is important that prices are competitive and not, as he implies, subject to rising quickly and then taking a long time to decline. The Office of Fair Trading last looked at this in 2013, but I expect its successor, the Competition and Markets Authority, under Andrew Tyrie, a noted consumer champion, to keep this under close review.