Derry Girls star Siobhan McSweeney has revealed she’s been living out of a suitcase and dealing with an “aftermath of anxiety” after a devastating fire at her home.

The actor – who plays no-nonsense nun Sister Michael in the Channel 4 sitcom – says she wants people to ditch cube-shaped block adaptors after fire inspectors said it caused the fire at her London flat.

Siobhan was out at the theatre at the time of the fire, which started at the side of her bed.

The star lost many of her possessions in the blaze and is now living at a friend’s house but has been left “with an anxiety that something can go wrong”.

“It takes me ages to leave the house, wherever I am,” she told the PA news agency.

“I have to go around plugging out everything and triple checking everything…

“For a long time afterwards I would wake up in the middle of the night and go round and unplug stuff.

“That was quite annoying for my friends, to be unplugging the television and resetting all their devices.

“Thankfully I have the best friends in the world who put up with my little neurosis.”

Siobhan said the anxiety “comes in waves” but admits to feeling “incredibly lucky”.

“There is a legacy of panic,” she said. “And if I hadn’t been at that show there’s no doubt, I have been told, that this would have been a very different story.

“It would have been the toxic fumes from the smouldering of the mattress… that would have got to me first.”

The actor was alerted to the blaze in November, when she got a call from her neighbour saying her flat was on fire.

“When I got the call everything blacked out. I can’t remember (anything),” she said.

“All I remember is that taxi journey home and feeling so worried about what was happening.

“I have flats above me and below me and elderly neighbours and I was just deeply worried that they were safe,” she said.

She said she had at first been “utterly convinced” she was responsible.

“That’s the first place you go to – that you’ve done it. It’s your worst possible nightmare, the idea that you’d put other people in danger.

“I thought it was something I’d done, a candle, or the oven. I had no idea that [block adaptors] were unsafe. I had many in the flat.

“Growing up, we used those for Christmas lights, for the trees and everything.

“It was a shock to me when the fire inspector told me it wasn’t my fault. That was such a relief.”

The fire service concluded the adaptor had fallen slightly out of its socket and created a spark which set fire to her bed.

“If people get rid of them that will be a bonus to a dreadful thing that has happened,” she said.

“I’m just urging people to not take the chance. It doesn’t matter if it doesn’t happen that often. It has happened.”

She said: “I’d left my really cosy, warm familiar home and I came back to a blackened, smelly, dark destroyed shell of a flat.

“I haven’t been able to go back into the property yet so I’ve been living out of a suitcase since then.

“I managed to get my father’s death certificate and a picture of my mother.”

Siobhan is preparing to return to her role as Sister Michael in a third series of Derry Girls, which is due to air later this year.

Speaking of her co-stars, she said: “They have been incredibly supportive. They’ve offered me beds and shoulders to cry on. We’re a very close cast and I’d be lost without them.”

She has appeared in a new video warning of the dangers of the block adaptor, which Electrical Safety First says many people have in their homes.

The charity said the product “puts undue strain on the wall socket and often do not come with a fuse”.

Multiway “bar” extension leads are the safer option, the charity said, but should not be overloaded.

More information is available at www.electricalsafetyfirst.org.uk.