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It's more likely than not. Asbestos cement is about 15% asbestos, the good news is that as long as you don't break, drill, or sand it down the azzy is well contained and considered pretty safe (more info here). Your local household waste centre (aka tip) will have an asbestos facility although you will need to double bag it with each bag sealed with tape and marked as hazardous in order for them to take it iirc. (You can buy specific kits from b&q I think)
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When you're removing it have a hosepipe with a spay rose available. Should you snap it or scuff the panel you can spray the area to suppress any airborne particles. The biggest issue is getting rid of it after you've liberated it from your soil. You might have to contact a specialist company to collect and dispose of it.
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The City of London will pick up your asbestos (service run on behalf of all London boroughs) - details at https://www.cityoflondon.gov.uk/services/environment-and-planning/waste-and-recycling/household-waste-and-recycling/Pages/Hazardous-Waste.aspx
Many civic amenity sites don't accept asbestos.
Looking at maybe unwilding our upper level at the back of the garden to grow more food.
This old corrugated stuff is embedded behind the retaining wall... is it likely to be asbestos based?
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