Looks expensive to me Protea for a second hand greenhouse you would have to dismantle and re-erect. If your Mum doesn't want to offend her friend she only has to say you don't want it- no space, or whatever. But if that is the way you go you do need to let her know ASAP so that she can make other aarangements.

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From each according to his ability, to each according to his needs.