Vigilant bank staff have saved an elderly couple from being conned out of £1,500 by a bogus builder who claimed to be their grandson.

It happened on Saturday when the pensioners called at the branch in Rose Lane, Canterbury, wanting to withdraw the money in cash.

Staff became suspicious of the man who said he was their grandson and the money was for building work.

But when they asked a few security questions, he was unable to answer and fled the building with a little girl who was with him.

Investigating officer PC Ben Crook said the incident, which happened at 11.15am, was being treated as fraud.

He said: “It appears the man, who had a little girl with him, had earlier approached the couple in their home and offered to carry out building work to their house but told them he wanted the money up front.

"It was a particularly heartless offence. The couple are vulnerable and the offender probably saw them as easy prey. But, thanks to the vigilance of staff, his plan was thwarted."

The offender is said to be white, aged between 45 and 49, of a stocky build with thinning brown hair.

"It was a particularly heartless offence. The couple are vulnerable and the offender probably saw them as easy prey" - PC Ben Crook

He was wearing a green polo top and was accompanied by a young girl aged about four who was wearing a pink, long-sleeved top and blue jeans.

Police are appealing for witnesses to contact them with information about the incident and are warning others to be on their guard against cold callers.

Police Constable Crook said: "I am also urging people to look out for their elderly relatives and neighbours.

"People should always check the identity of anyone knocking at their door. If you are not sure phone the company they are representing and confirm they are legitimate.

"Genuine callers won’t mind. If you are in any doubt ask them to come back at a time when you have a chance to have someone with you.”

Anyone with information should call Kent Police on 01843 222289 or Crimestoppers anonymously on 0800 555111 quoting reference number SI/ZY/007846/16.