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I'd like to know why as well ... not new ...
The concept of raised bed growing goes back to medieval times where the beds would typically be edged with wattle fences. Moving forward 500 years or so, the Parisian market gardeners of the 18th Century built up their plots using the plentiful horse manure of a pre-motor vehicle city and compost. Eventually they had depths of topsoil well in excess of a metre, sometimes two metres!
https://www.allotment-garden.org/gardening-information/raised-beds/
not4sale-
I've built wattle fences around some of my new veg beds in my new garden as the soil is heavy clay/lots of pebbles (as the 'River' Ching runs at the bottom of the Garden,) so needed kind of raised beds on the cheap-I built them by removing turf in Autumn, turning upside down to compost it then adding some raw manure/compost over winter and using the branches/whips of some overgrown elderflower and buddleia for free fencing. Good to see part of my method is at least 1000 years old...
jeff80
Any particular reason why? Is the allotment committee suspicion of new fangled methods?