I successfully moved my bay tree from Cheshire to Bucks two years ago - it was about 5foot tall and I took it from the garden into a huge pot, where it still remains and seems to be flourishing perfectly happily. Yours is quite a bit bigger though, not sure you could get up a large enough root ball? still, give it a go, what have you got to lose except a bit of digging time?

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Life may not be the party we hoped for but since we're here we might as well dance