In Aberdeen's boom years of North Sea oil, from the late 1970s through to the early 2010s, it didn't have to work hard to fill its hotels and restaurants and get the cash tills ringing because of the wealth the energy industry brought to the city.

I remember weekends with friends as a teenager, spending whatever cash we had in the fashion chains and shoe shops. Later came the pubs and bar-hopping, and trips to the art deco Capitol Theatre (now office space), where I saw Duran Duran.

But by the end of 2022, Union Street had hit rock bottom. Aberdonians had long deserted the High Street for a shopping centre, which opened in 2009 next to the railway station.

"They'd fallen out of love with their city," says Bob Keiller, head of Our Union Street coalition, a community-led group formed after an emergency summit to reverse the decline.

The first thing it did was listen to what residents wanted, receiving thousands of submissions. Restoring a bit of civic pride and filling empty units became the focus.

It's been a co-ordinated effort, involving letting agents, the council, landlords, businesses and a big team of volunteers, led by Keiller, a former FTSE 100 CEO, who isn't getting paid. He has a map on his office wall, detailing the status of every property, unit by unit, with colour-coded Post-it notes.

They audited the street, tracking down absent landlords, and logging what was empty and why. Volunteers offered to give the empty properties a clean and a lick of paint, to make them more attractive to let. They also spruced up the streets, picking litter, weeding, and painting bins. A small team still goes out once a fortnight.