Goodwin, computer glitches, Libor... now RBS can’t even lock its doors

• Care worker fell through unlocked doors of branch in Carnoustie setting off alarm

• Incident is latest embarrassment for bank which was unable to dispense money to some of its customers in June

Then it left its customers fuming after a botched computer upgrade saw payments disappear and accounts plunge into the red.

It is currently facing paying out millions for its role in the Libor-rigging scandal.

And now, just when Royal Bank of Scotland bosses must have hoped the worst was behind them, someone has forgotten to lock the door on the way out of one of its branches.

Embarrassed officials at the RBS have been forced to launch an investigation after the doors of the branch in Angus were left unlocked all weekend.

The mistake was only discovered by a care worker, who almost fell through the doors after leaning on them as she waited for a bus following a nightshift on Sunday morning.

Caroline Lamb set off the alarm system at the branch in Carnoustie – but could not understand why the doors had been left unlocked since the bank closed on Saturday at lunchtime.

Miss Lamb admitted she had got the “shock of her life” and phoned the police in an attempt to find out what was going on at the bank in the town’s High Street.

The 22-year-old said: “I couldn’t believe it, my eyes just about popped out of my head.

“They [the doors] must have been open since lunchtime on Saturday.

“There are wooden front doors with three steps leading up and I had just sat down after my nightshift to wait for the bus.

“I leaned back on the door and the next thing I knew they both opened and the alarm went off.

“There were loads of people staring at me, with expressions like, ‘what has she just done?’

“I think people knew I hadn’t been in the bank, but they were wondering what had happened. Some people were laughing.”

Although a startled Miss Lamb says she can see the funny

side of the incident, she admitted the security issue was a

concern.

She added: “I’m not one of their customers, but I think it is just stupid.

“Somebody could have easily got in during the night and robbed the place.

“I personally think they need to tighten up their security – all somebody needed to do was push the doors.”

Bosses at the Royal Bank of Scotland yesterday confirmed they had launched an investigation into the incident.

A spokeswoman said: “We are investigating why these doors could have opened.

“We are pleased no-one was hurt and the alarm worked as planned.”

A spokeswoman for Tayside Police added: “Officers attended at around 8:30am on Sunday for what subsequently turned out to be a false alarm.”