if you goto a suitably sized sainsburys and ask nicely, they may give you the vegetable packing cases. worked for me. as they can be dropped back off with anyy sainsburys.
also big yellow storage sell boxes. i've ordered from these: http://www.thepackagingstore.co.uk/main.asp?catid=66&gclid=CLX27vecmZwCFUQA4wod1AcVdA
http://www.cardboardboxes.co.uk/
may be useful as well, you need double walled boxes.
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if you goto a suitably sized sainsburys and ask nicely, they may give you the vegetable packing cases. worked for me. as they can be dropped back off with anyy sainsburys.
also big yellow storage sell boxes.
i've ordered from these:
http://www.thepackagingstore.co.uk/main.asp?catid=66&gclid=CLX27vecmZwCFUQA4wod1AcVdA
http://www.cardboardboxes.co.uk/
may be useful as well, you need double walled boxes.