As well as a duty for companies not to trade unfairly and to avoid misleading statements or omissions, there is also a duty on businesses not to conduct aggressive sales practices, such as harassment, coercion and undue influence.
This would tackle cases such as the pushy sales tactics Vivien Herbert said she had to endure.
Ms Herbert said a solar panel salesman got very annoyed and called her a timewaster when she pointed out that she was not going to sign up for a system costing thousands of pounds during his first visit.
But the wide-ranging nature of the regulations mean that they will also cover issues such as fake testimonials by "customers" giving favourable reviews of products, holidays or shows.
"This brings in a new concept of fairness, a brave new world for businesses dealing with consumers and advertising," said lawyer Philip Carnell of CMS Cameron McKenna.
"If marketing companies are going to try and be sneaky, that will now be a strictly liable criminal offence."
Brought to justice
Some of the 31 specific unfair sales tactics used by companies that are covered in the legislation overlap existing rules.
They also include advertising products knowing there is insufficient stock to meet demand, falsely claiming that customers would get a better deal if they signed up immediately, and directly targeting children to say they would be disadvantaged without a certain product.
Trading standards officers will be policing the new regulations. They could concentrate on the most prevalent complaints such as second-hand car sales and property repairs.
David Sanders, lead officer for civil law at the Trading Standards Institute, said that the more serious cases were likely to be dealt with under criminal law.
This would mean maximum penalties of up to £5,000 for anyone found guilty in a magistrates' court, or a fine of up to £5,000 and/or two years in prison in cases heard in a Crown Court.
But Mr Sanders had a word of caution for consumers expecting all con-artists to face justice.
"We are a limited band of people and we are only going to investigate the most serious cases," he said.
And Mr Sanders added that, especially in the smallest local authorities, there were not enough trading standards officers and they were not well enough resourced to conduct in-depth investigations into every potential breach of the rules.
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