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Something like this maybe https://www.safelincs.co.uk/easyscape-fire-escape-ladders/ although I'm not sure if this specific one is long enough.
Or this for the comedy description https://www.amazon.co.uk/Ladder%EF%BC%8CEmergency-Carabiner-Children-Balcony%EF%BC%8CEmergency-Ladders/dp/B07VN64R76
About 60cm, and awkwardly shaped - too thick for me to be comfortable with those ladders that have a hook contraption for the top of the sill. Plus they're a pain to store.