Sheila Reynolds, the owner of S&D Living, said she only decided to check the CCTV footage after noticing cigarette butts on the ground and some damage to the back fencing.

"I sat there and thought 'I am just going to have a look at the video to see'," she said.

"I was shocked to see young teenagers. They were opening the door, going around the back and hanging around out the back.

"There would be a group of three; then they would let four in then another six."

Mrs Reynolds said she could one young man standing guard, and he would look around before letting groups of people in and out.

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One of the videos captured was time-stamped 2.20am, and Mrs Reynolds said the knowledge had terrified her.

"It's very scary," she said.

"I am worried when I come in the morning that they will be here.

"I submitted it to the police helpline, but no action has been taken."

Mrs Reynolds said she initially had installed cameras inside and outside the shop to dissuade would-be shoplifters but was grateful they had shed light on what is happening now.

She added it was not clear what the groups of teenagers were doing, but was concerned they were out roaming in the early hours of the morning.