From today, there are new consumer protection laws applicable in the UK, which outlaw all sorts of rogue trading, bogus selling and advertising. This will include misleading blogs by companies.
New rules for consumer protection
Will fake business blogs crash and burn?
These are actually an implementation of EU directives. Ireland already has such laws, and the other EU countries either have, or will implement such laws. Something else to remember next time UK citizens bleat about the EU being a waste of time.