Letter to the future written by 10-year-old Rachel in 1982 turns up hidden in an Essex stairwell

A handwritten note addressed simply "to a finder" has surfaced almost half a century after a 10-year-old girl tucked it into a hiding place in her family home — and been identified within a single morning, thousands of miles from where she now lives.

The scrap of paper was discovered during renovation work at a house in Hockley, Essex, where a worker came across it hidden in the cavity behind the stairs. The worker handed it over to Michelle Harwood, the 36-year-old charity worker who lives at the property, and she immediately realised what she was holding: a note that had almost certainly been written decades earlier. The letter is dated 12 August 1982 — eight years before Harwood herself was born — and was addressed to whoever found it, in careful blue ink on A5 lined paper, alongside details of the date, the writer and the then-reigning Queen, as well as the pets belonging to the child who wrote it.

What struck Harwood first, she said, was the handwriting. It looked "really neat" for a child, which raised the question of who had penned it and why it had been left to gather dust in a void inside the house. Rather than keep the discovery to herself, she photographed the note and posted it to her local Facebook community group on Thursday morning, asking anyone who might recognise the handwriting or the name to get in touch. She described the appeal publicly as "a long shot": she had no real expectation of tracking down the writer at all, let alone doing so the same morning.

The response was immediate. Within an hour, several members of the group had located and tagged Rachel Miles, now a 54-year-old teacher in Milton Keynes, Buckinghamshire, who responded to the post. The BBC subsequently spoke to Miles, who was 10 when she wrote the note — close to half a century ago.

Miles explained the context behind the letter: she had written it after her father discovered a cavity behind the stairs at the house, and decided to use it as a postbox for the future. The habit, she said, reflected the popularity of time capsules in 1980s Britain, where children's television programme Blue Peter had popularised the idea of sealing messages and objects away for strangers to uncover decades later. "I just thought it would be quite nice to basically post a letter for the future and I'm obviously quite delighted to see that someone had found it," she said.

For Harwood, the emotional impact was immediate. Reading the opening words "to the finder", she said, "just immediately gave me goosebumps". She added: "I couldn't believe that note had been there longer than I've been alive." The letter is now displayed on the Harwood family fridge, an apt resting place given the coincidences that have emerged since it was written.

Those coincidences are striking. Harwood and her family have lived at the Betts Farm Estate property for 11 years, but Miles said her own family were resident there much earlier, back when the estate was little more than a building site that she and her friends would play on. In other words, the note was hidden not in a mature family home but inside a property still under construction, at a time when the Harwoods' future neighbour had not yet been born.

There are further echoes between the two households. Miles, who named only her cat — Kizzy, she said, was "a legend of those parts" — grew up at a house with a cat, and so did the Harwoods. That continuity, Harwood suggested, explains why a catflap was already fitted at the back door when her family arrived. Miles was also born in Bury St Edmunds, Suffolk, close to where Harwood's husband, Jonathan, grew up, another small geographical link between the writer and the finder.

For Miles, the discovery has reconnected her with a place she left long ago. She said it was "lovely" to relive her Essex childhood and "really nice" to see how many people remembered her despite having moved out of the county. "It's nice to hear familiar names that I knew and to be reconnected with the area," she said. She was also struck by her own handwriting, which she said she "couldn't really believe".

The story has prompted wider reflection on the durability of small acts of hope. Letters and objects sealed away for future generations are a long-standing tradition, and the discovery arrives amid renewed interest in the practice: recent BBC News reporting has covered pupils filling time capsules due to be opened in 2056 and 2126, and a builder unearthing what he described as a "spooky" 1964 time capsule. What distinguishes the Hockley find is the speed of resolution. Rather than resting unopened for future generations, the note was recovered during ordinary building work and then identified the same morning it was shared.

Harwood credits the reach of social media for the outcome. In her post she said: "I think social media is great for things like that, because so many people are connected." It was that network of former neighbours, old school friends and local residents — many of whom remembered Miles from her childhood on the estate — that turned a 44-year-old curiosity into a reunion.

For now, the letter is not destined for a museum or a sealed box. It sits on a fridge in Hockley, read and re-read by the family that found it, while its author ponders the fact that a note written when she was 10 has, at last, reached the audience she was hoping for.