'It didn't feel like a scam, but I lost £520'

When two men knocked on Christine's door saying her gutters needed cleaning and roof tiles needed replacing she agreed, and handed them £520.

That was a mistake. "When they were finished one said he'd give me a certificate for a 10-year guarantee.

"But when he went to the van to get it, he just drove off. I looked at the gutters and I could still see the weeds."

The 70-year-old from Sussex never saw the cash again - she had been scammed.

"The worst part was that it didn't seem, or feel, like a scam. They looked professional and said they'd completed work on my neighbours' houses," Christine said.

She's one of almost 20,000 victims of similar scams who complained to Citizens Advice last year, an increase of 8% from the previous year.

Many victims ended up much more out of pocket than Christine: fraudsters on average cheated people out of almost £3,000 through these types of scams.

Scams sent through the post hit people even more, with the average loss at £5,435.

"Tried-and-tested scams still pose a huge threat," warned Gillian Guy, chief executive of Citizens Advice, which along with Trading Standards has launched a Scams Awareness campaign.

"Even in this digital age where online scams are on the rise, scammers are continuing to use traditional routes to prey on people.

"Tactics like doorstep selling, sending unsolicited letters and cold calling give scammers the opportunity to build a relationship with their victim."

The campaign - which has the slogan "Stop, report, talk: Be #scamaware" - hopes to encourage people to talk about their experiences and look out for others.

"People need to speak up about this sort of thing," says Christine. "Had I known the warning signs of scams - like being asked to pay up front in cash - alarm bells would've rung and I'd have thought twice about handing over my money."

If you're worried that someone you know has become victim to a scam, look out for the following. Are they:

If you think someone you know is being scammed, take the following steps:

"We believe that the number of complaints about these scams is the tip of the iceberg - only 5% of scams are reported," warned Lord Toby Harris, chair of National Trading Standards.

He added that scams which do not take place online can cause significant harm emotionally as well as financially, particularly when people - often in vulnerable situations - are deceived and put under pressure in their own homes.

Research by Citizens Advice showed three out of five people reported being targeted by a scam in the past two years. Of those targeted, less than half said they told anyone about it.

"We must work together to combat fraudsters by being more open about scams and helping each other understand what to look for," said Gillian Guy.