Remote control detector's jackpot
decima can cover the ground automatically, and save on the more back-breaking work, combing for coins.

Decima Watkins, 20, said after initial trial and error the detector, which cost £100 to make, has paid off.

They spent more than a year building the "Decima Detector" in Mr Watkins' garage and found a haul of old coins while trying out their machine.

They have collected more than £2,000 in cash on Porthkerry beach near their home, as well as finding 5,000 assorted silver and hammered coins, some they say date from the 14th Century.

Decima now hopes a company might be interested in developing the machine.

"It took around a year to make and it cost £100. We used recycled materials, visited scrap yards and went to tips to get hold of things," she said.

"It's even got rechargable batteries."

The remote detector also has lights on it and it can be taken out in the dark.