Ebay isn't your only option ... as you're making a long term investment for the next ten or twenty years, I would buy decent crowns from a reputable nursery. This place has been around for a good long while and has remarkably good reviews, https://www.blackmoor.co.uk/products/15451
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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https://www.blackmoor.co.uk/products/15451
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.